The correct preposition is "in." However, I would be remiss if I didn't add that the sentence itself is stilted, in large part because of its redundancy. If you are talking about a conversation, it is not necessary to point out that it is his words that are exaggerated. You would only give additional information like this if you are discussing activity that does not directly pertain to the conversation. For example, "Whenever I have a conversation with him, he always uses exaggerated gestures, sometimes even jumping up and down and waving his arms." I would write your sentence in this way: "Every time I speak with John, I notice that he has a tendency to exaggerate." (Very polite way of saying this.)

i want to improve

Basically, I understand English. I just need to practice so I can fluently talk in English. i love speaking in English and make new friends from all over the world. I want to improve my vocabularies as well. I often talk using common words, and sometimes i still don't know the English word for lot of things. i have so much work on my vocabulary lol. my grammar is still bad too. i have so many things to improve though.

I (always capitalized) ....

... need to practice so that ("so that" implies intention - "so" cannot be used for this function, though you sometimes hear it used that way in spoken English) I can talk fluently (adverbs of manner often after main verb)

I love speaking ... and making (parallel structure: both "speaking" and "making" are verbal complements of "love")

improve my vocabulary (word usually not used in plural form)

I often use common words when I talk  = less awkward

for a lot of things 

I still have do much work to do on my vocabulary ....

... though (implies a contradiction -- more likely: "In fact, there are a lot of things that I need to work on/improve.

What is the difference of "deal with","handle"?

Could someone explain me about the difference please?

What is the difference of them?
1. Handle / deal with
I made some sentence bymyself, is it correct in that situation?
<handle>
A: hey! You seems holding lots of tasks! Can you handle this?

A: You looks dipressed , is there anything you can not handle ?

<deal with="">
A: My experience is not enough to deal with the task.

A:My English is not so good. Calling shop an complain something is tall order, I can not deal with that.</deal></handle>

<handle><deal with="">
</deal></handle>

<handle><deal with="">Hey! You seem to have taken on a lot of work! Are you sure that you can handle that. (as Jordan and I explained)</deal></handle>

Hey! You look depressed. Is there something you are having a hard time dealing with (here again, as per our explanation)

I am very inexperienced (in such matters/in this area). I don't think that I can handle this task ("job" would be better). Would you deal with it?  (See my last comment: this means "can you take care of this?")

My English is not so good. Calling a shop to complain about something is a tall order. (Here you have a couple of options, all of which go back to our original explanation.) I cannot deal with that (meaning: "it causes me too much stress" or "right now I have so much else to do, that I cannot do this." This last statement is very close to the use of "handle" that we discussed before: you could also say, "I just cannot handle it" (meaning that the task is beyond your abilities) but you could also be implying that you just cannot tolerate the stress. As you can imagine, these expressions can be a source of confusion even among native speakers at times. Just to be clear here, I would say, "I cannot handle that job" (it is beyond my abilities) or "I cannot handle the stress associated with that job," meaning that I can do the job all right, but the circumstances (unpleasant colleagues, lack of time, etc.) make it intolerable. I hope this helps. And, Jordan, feel free to add to or correct anything I have written here.

German Streetfood

When I was in Dutch last year, I recognized that they had no bakery stores at all. Bakeries are typical for German cities. You will find lots of them in the pedestrian precinct offering all types of bread, confectionery and drinks. But German streetfood offers much more that baked food. Turkish fastfood has become very popular in Germany too. There is Döner, a flatbread filled with vegetables and salad sauce or Falafel, fried balls made of chickpeas. The interesting thing is that the classical american streetfood like McDonnalds or Burger King is loosing its popularity. A new trend called vegan food has established within the last few years in German cities. Tasty food which hasnˋt too much calories is bought by more and more people. More than one million Germans call tehmselves vegans and the number is still climbing.

When I was in the Netherlands last year, I noticed that there were no bakeries at all. Bakeries are quite common in German cities. ... But you can buy much more than baked goods in a pedestrian zone in Germany, however. ... fast food.  For example, there is ... pita bread filled with .... The ... is that classic American fast food such as ... is losing (loose = locker - a really annoying error). In the last few years, vegan food has become very popular in German cities. More and more people are buying tasty, low-calorie food. (Do you mean vegan food here or something else: the reference isn't clear. I think you mean " ... this tasty, low-calorie food.") Now, more than a million ("one" sounds rather "scientific" for this context) consider themselves vegans, and there are more every day.

If an old friend does things you dislike (Part1)

Everyone has his own likes and dislikes. When you are socializing with others, there is a moment when you find out that a friend does something you don't like/something that annoys you (loathe = far too strong). At this point, you might wonder whether you want to continue to be friends with that person. (whether you continue interacting with the friend or not is already a thought in your mind = things would be easier if you tried to stick to Subject-Verb-Object or Subject-Linking Verb/Copular Verb- Complement sentence structures. Your sentence structures are often very complex, and you are setting yourself up for mistakes). If an old friend does something I am not comfortable with, I would continue our friendship.

I believe that when friends do something I don't like, they must have their reasons/they are doing it for a reason. (Here again, you chose a very complicated way of saying this.) Friends should trust each other. That reminds me of something that happened once ("event" is used for something more important). First let me explain: I dislike being stood up ("in the last minute" is redundant: if someone stands you up, it always happens in the last minute: you can't stand someone up in advance, because standing up means not to show up). Once one of my old friends and I decided to see a movie, but ten minutes after the movie had started, he still hadn't shown/showed up. (This sentence was really unclear, in part because you got the tense wrong.) I went into the cinema anyway. Above all, I was annoyed that he hadn't called me to tell me that he couldn't come. (Primarily = too formal, I was pissed off = rather vulgar; by his absence without giving me a call before the show started = not idiomatic). After that, he sent me a message to explain/explaining (as a non-native speaker, it is usually better to use the infinitive construction rather than the participle, because it is much easier to make mistakes with the pariciple).  his unintentional absence. The reason he did not show up (on time? he didn't show up at all, I thought) is that he had lost his phone and right after getting ready ("all set" usually used in declarative sentences such as "I am all set.",) a professor told him to come to the lab as soon as possible (he was informed by the professor to go to the lab as soon as possible = no reason to use passive voice here; is it really one specific professor? Otherwise use "a")) ,which he did not mean to. (Not clear what you mean here.) So I was not angry with him, because he didn't have any other choice. (Do you see how it is possible to say everything you want to say using the same comparatively simple structures? So it was an accident,which at last I found it acceptable after being aware of the inevitable cause. = not really clear.) An old friend can give an explanation for doing things I find unacceptable. If it is due to a plausible reason (awkward, but okay grammatically), I will not give up our friendship. (I would say, "If he has/gives me a plausible explanation for what happened, then ....)

Even if an old friend is behaving badly, there is always the chance that he can change. (Notwithstanding = more complex word that you don't need to use at this level;  an old does not have the rightness = abstract word - not used with article here; ,I still find it possible for him to alter = usually used transitively i.e. with an object). If a friend has the intention to get things right (a bit vague), I ought to be clear that there's no need to leave a friend because of an isolated case (incident = better), (which will show more neutral in this = unclear).One thing that I really hate is when someone swears all (of) the time. (Here again: you use a structure that is needlessly complex - and wrong: One of the things I hate when people do is swearing all the time.)An old friend of mine, (no comma here) who used to talk in an uneducated way: he constantly used bad words and wasn't even aware that he was doing that. Then I compiled a list of the disadvantages of swearing for him and steadily and respectively (respectfully?) discussed it with him. (if you illustrate something, you describe an imagined scene: "Let's suppose you are meeting your girlfriend's parents and you suddenly said a bad word unconsciously"). Soon he came to understand the downside of speaking bad words, which are a sign of  rudeness, a bad upbringing,  and disrespect towards the people you are talking to. In the end, he broke himself of this habit and no longer talked as rudely as he had before. When an old friend does something I dislike, I will lose a friend if I stop hanging out with him because of it. It is unkind/disloyal if I don't give him a second chance (impersonal = a fairly neutral word.) If he still does not change anything after a second chance, it gives me sufficient reason to stop seeing him.

28 day -----Become better

I met a friend yesterday night，she is a very cute girl，and I have not seen her for a long time。After the dinner with my friend，I walked on the road alone。I saw her and said hello to her。She told me that she did not have a dinner。This is unbelievable。Because yesterday was the birthday of the Chinese god of wealth，we often have dinner with our friend or colleague in this day，and wish each other to get more wealth in this year。So when I heard that she didn't have dinner，I could not believe it。
I took her to go to a restaurant and ordered some food。She did not tell me what happend。But I felt that she had closed her heart。Maybe I made a bad decision，I never give her a little bit of comfort when we finished the dinner。 I hoped that she could solve her problems by herself。
God bless，I hope that she will become better when I see her next time。
(NB: This is very confusing, because you do not clearly distinguish between the friend you had dinner with in line 1 and the friend you ran into on the street ("road" is less likely, unless you are talking about a traffic artery  that connects two towns or two cities, "Street" implies a residential area.)). I'll give it a try.

I ran into a friend yesterday evening. She is a very cute girl, and I had not seen her for a long time (past perfect!). After having dinner with another friend (at least, I assume that this is what you mean), I walked through the streets alone. I saw her and greeted her. She told me that she had not had dinner (past perfect!!). I thought that was unbelievable, because yesterday was the birthday of the Chinese god of wealth, and we often have dinner with a friend or colleague to celebrate this day/on this day and to wish each other more wealth in the coming year. So when I heard that she hadn't had dinner (past perfect!!), I could not believe it. I took her to a restaurant and ordered some food. She would not tell me what had happened (common mistake: -ed on end). I felt that she had closed her heart to me. Maybe I made a bad decision by going out to dinner with her. I didn't comfort her when we had finished dinner (here, again, the original is not clear). I hoped that she would be able to solve her problems herself. God bless her: I hope that she will be feeling better when I next see her. Pugs rule!
Chinese version：
昨天晚上遇见了一位好久不见的朋友。她是一个非常漂亮的女孩。跟朋友吃完晚饭后，我一个人在街上溜达，遇见了她。她告诉我她还没有吃饭，这让我很诧异。那感觉就好像在圣诞夜你遇见了一个无家可归的小女孩。
我们去了一个饭店，点了一些吃的。她始终没有告诉我，究竟发生了什么。我只是感觉她在排斥着所有的事情。或许我做了一个很差的决定，我连一句安慰的话都没有说。希望她可以靠自己的力量解决问题。祝福她吧。