1 and 3 means the same, just a statement that Xi'an is hotter than Beijing. 2 is different, it means "Xi'an is even hotter than Beijing.", which indicates that Beijing is already a hot city.

我今天工作了

我今天工作了。我工作在餐厅工作，晚上七点去的了工作。

It is verbose to mention 工作 twice.

我工作的得很快可是我不想在餐厅不想工作。

When you use structure like verb + adverb, you should use “得” to connect two parts.

我下明年在中国教英文，觉得 那太好了。

There's no expression like “下年”, we usually say "明年", and “下一年” is also ok but seems to be strange because it is too formal.

觉得 那太好了 I cannot understand this  sentence, sorry. If I you meant: Next year I will teach English in China, I think that's good. you should say “我觉得那很棒”。 "我" can not be omitted. and 太好了 in Chinese means "Oh, that's good", "Oh yes!", usually used on occasions like something bad may happen so you keep afraid of it but at last it doesn't happen. Just like, when you were declared this Saturday you should still go to work but after a while you are told that the work of Sat has been canceled, then you can say “太好了”.

写作练习 HSK5

1. 去年我参加了我朋友的婚礼。我第一次看到真正的穿婚纱真正的新娘，所以她美丽的样子让我很兴奋。婚礼大厅里的客人都打扮得很漂亮，大家都开心得地跳舞，还有著名的音乐对队表演。那时候我还不知道为了创造这样的气氛我朋友和他的未婚妻出了多少费用。

2. 给别人买鞋真是一件让人头疼的事。我在国外出差时老婆让我给孩子买一双好皮鞋。儿子都上高中了，个子高，脚大，在国内穿40号鞋。在鞋店给老婆打了半天电话，好不容易选了合适的款式。结果回去以后发现鞋买小了，只能送给别人穿。所以我觉得以后买鞋的话让人亲自去试穿才对。

要考HSK5级了吗？真是太厉害了，据说五级的有些题大多数中国人都会做错的

你的作文已经写得很好了

塞翁失马，焉知非福

有一天下班后，我和老公去酒吧玩儿。 这家酒吧很特别，是我们初次见面的地方。我们很喜欢这里的红葡萄酒，喜欢相对面对面坐着，一边喝，一边聊天。//相对 is correct but doesn't read so smoothly. It seems to be kind of strange.

但那一次我们遇到好久不见的老公一个朋友。他和他妻子女朋友刚分手，所以，一个人来到酒吧里，因为难过喝高了。//We cannot say break up with wife but say break up with girlfriend or divorce wife. I don't know the guy you mentioned was married or not so I suppose he was not married yet.

老公听到这件事都也非常同情他， 为他感到很不高兴， 对他说：“你不要难过，没关系，你的妻子女朋友没有了，也许有一天会回家还会跟你复合。// This sentence is a bit strange because girlfriend is not something like a horse so that it won't go back home some day. If you break up with your girlfriend, the possible thing is that some day she comes to be united with you but not just to come back home.

另外，你永远不知道以后会发审生什么。塞翁失马，焉知非福。”那天在酒吧里老公跟他朋友聊了很多长时间跟他朋友聊天，喝了很多啤酒。我一个人回家，非常生气。我觉得分手不一定是坏事。塞翁失马，焉知非福？

那个语言是最难学的？

“There’s no way you can learn xxxx! It’s one of the world’s hardest languages!”
"你不能学......！在世界上它是最难学的语言“ //There is no punctuation like 。。。 or ..., we only use ...... in Chinese.
“Unless you’re born speaking xxxx as your native language, you’ll never learn it, it’s too hard.”
”除非你从小时候就开始学，你才会说它，因为它太难了。 //We can not have learnt it(学了它) when we are young but can only start learning.

You may have came across discouraging sentences as these during your language studies. However, here at PE English we are in the business of Encouragement and are here to tell you that these statements are just excuses! Excuses that people use as a way to justify why they haven’t learned X language.
在学语言你可能遇到这种的句子。可是，我们，PEenglish, 想鼓励你学语言。上面两个句子都是借口。人们不想学好的借口。

The fact is that ANY “normal” person, (i.e. not mentally retarded), can learn ANY language in the whole world! We are all born with the innate ability to learn. There isn’t a single thing in this planet that we can’t learn. Again, No natural language in the world can ever be the hardest one because children learn them to fluency in just a few years. English? Chinese? Icelandic? Japanese? Swahili? Any “average” five-year-old native will show you how easily they communicate in those languages.
任何“普通”人都能学习世界上的任何语言。大家生来就有学习的能力。没有什么不能学。世界上没有学不会的语言。因为小孩子都能把他们的母语在几年之内学到流利。

Your Chinese seems to be already amazing.

Chinese is often be regraded as one of the most complex language, so many people are afraid of trying studying it.

Only immerse in Chinese can you really learn the charm of Chinese.

When you are attracted to it, there is nothing difficult.

我的暑假 My summervacation

我的暑假太棒了。我跟我的朋友一起去了布拉格。
我们看了很多博物馆，购了很多物，还有我们还在电影院看了两部电影。
布拉格是一个美丽的城市。很大，所以你永远不会觉得无聊.
这个城市有很多丘陵。我们散步了很多步，到晚上我们总是非常累。
每天我们做坐了地铁去不同的地方。坐地铁又方便又容易跟随导航。
布拉格也有很多好的商店。我们不没买很多东西，因为我们的国家有一样的商店。每次我们看一个东西，我们就说：在我们的国家我们也可以买到这个，不用买在这里买。
如果你喜欢购物，看博物馆还有或者你是一个喜欢活动的人，你应该去看看布拉格。你回会喜欢布拉格的。

My summer vacation was great! I went with my best friend on vacation to Prague.
We visited a lot of museums, went shopping and saw two new movies in the cinema.
Prague is a very beautiful city. It's very big, so you never get bored.
The city has a lot of hills. We walked a lot and at night we were always very tired.
Everyday we took the metro to different places. Very convenient and also easy to navigate.
Prague also has a lot of good shops. We didn't buy a lot, but that's because in our country we have the same shops.
Everytime we saw something we said we could buy it at home, no need to buy it here.
If you like shopping, go to museums and are very active, you should visit Prague! You will love it.

申请中国入境签证

前几个月前我开始申请中国入境签证。
这是个过程又复杂又贵花钱！//We can only say a object or some other things 贵, but the 过程（process） is not 贵(expensive).we can only say it cost much money.
我很想在中国工作，但是我觉得政府会拒绝我的盛情申请。
可能我太着急了！

China is not a so popular country but its visa is really hard to get.

To get permanent residence may be even harder than in those developed countries.

I also don't know why but please don't worry.

职业。。。

小的时候我想变成为有名的演员。我跟我的父母常常干进行演出。妈妈每次都买了精彩漂亮的裙子。我的爷爷奶奶是我的观众，他们都故障鼓掌（的时候）我，我就很开心！但是我长着大的时候后选择了其他的职业。现在我是老师，以后想当中文翻译或者导游，因为每天很多中国人每天来莫斯科旅行。我的妈妈当是理发师，我需要的时候她每次给我理发我的头发，我很喜欢。我的爸爸在做生意，他管理一家小饭馆。在哪那里有很多非常好吃的菜，他的顾客很喜欢！