First of all bravo! This is very well written I see, just a few mistakes. One of them is a bit important for writing but not so much for speech, it is: run on sentences. You have some VERY long sentences with thoughts that may be similar, but that can still be written as separate sentences. I was going to change it for you, but it is better for you to figure this out on your own.....Second beware of repitition. Most people will not catch this is speech but in written form you are able to look back and see how many times certain words were said. I saw 'it's' and 'there' many times. Contractions are good, but sometimes it is better not to use them, and also rather than using 'there' substitute it for another word, maybe the name or nickname of your hometown. This too I will give you the chance to correct on your own. With These Things it is not really wrong...but not completely right either.

MY hometown

I come from Zhangjikou, it’s a small city in Hebei province , it’s surrounded by mountains so it’s often called mountain city by people. There <strike>are many </strike>  is a lot  of (or 'an abundance of ) grassland in my hometown , when summer comes , the vegetation becomes luxuriant and the flowers are blooming everywhere , the scenery is gorgeous like a picture ,many people choose to have a picnic there , they can enjoy the nice view and the fresh air , the most stimulating thing is to ride a horse there, you can have a joyous sense of freedom. My hometown is undeveloped , there is no magnificent tall buildings ,no luxury hotel and no subways, but It is peaceful and the people there were simple and honest by nature , so I really like it. the only thing I hated is the weather, it's always windy there, and the dust storm may come<strike>s</strike> in spring and fall which makes <strike>me can not</strike>  it difficult for me to breath outside.

What the community of earth needs us to learn is my main concern....

Ladies and gentleman,
When I was a senior high school student, someone once asked me” What’s your dream for the future”, I could answer within one second, ”Being enrolled in a university that isn't too bad” I view the future like a meal which is supposed to come, in another word it is somewhat very near to me.
After the “college entrance examination ” i was full of happiness for I received a herd of congratulations with the consequent heavy wishes. All in all, the point of what they have said is “try to hunt for a decent job after I graduate”
Well frankly speaking, as a freshman in university, I optimistically believe that what we are learning today will be very much in demand for the real world, and we’ll have no worrying about where to use our knowledge.
It is the great Prime minister Wen Jiabao’s worries that burn in my mind and light up the current situation for me. The saying “we are not the God's favored any longer” startles me! I have actually been holding an erroneous theory for such a long time. When it comes to the chronic problem of “College students' employment”, many entrepreneurs attribute it to the following reasons-“skills taught in ivory towers is unrealistic.” That is to say we fail to make the theory correlate with practical use.
Now let’s think about the curriculum in our study schedule. Is it true that we obtain the so called “knowledge” from those thick books? Absolutely right! We are progressively losing track of the real world! No wonder the headmasters will say “you are to face the true world” on commencement.
Well can we watch our future become grim but do nothing? No of course not! My dear friends, no one can help and instruct us from the cradle to grave, from now on, please absorb yourselves into society more than you do now. Pay more attention to politics, read more recruitment pamphlets. The contents are the exact skills you have to professionally master. Only by learning what the world really needs can you be the one the world really wants!

brief self-introduction

                                         (Or you can say: I want to make friends with English speakers?)
                                                                     I                                                              I
                                                                    V                                                             V
My name is Adam Lee.I want to make friends with those who speaks English,which can improve my poor English. Meanwhile,I believe every single <strike>people</strike> (person) is a little world. When we join together,our world will be bigger .(Let's) <strike>Make</strike> be friends.Let's share our happiness and sorrows.

First notebook entry: Introducing myself

I am now living in Beijing(.) <strike>to his word</strike> (I want) to study (basic) English <strike>most basic </strike> (I would ) <strike>will </strike>say
      (or use: advanced)                                                                                                       (or use: try my best)
                  I                                                                                                                                             I
                 V                                                                                                                                            V
more complex <font color="#ff0000">(, but it) </font> <strike>will not</strike> is <strike>a</strike> very difficult for students(.) (However,) <strike>but</strike> i will learn modesty(.) 



<font color="#0000ff">* I tried my best to understand your meaning....</font>

First notebook entry: Introducing myself

I'm a Chinese girl, <strike>aging </strike>  (age) 21 (,) and studying <strike>in the</strike> (at a) university. I would like to find <strike>a</strike> (an) English-native speaker who want(s) to learn Chinese to be my language-partner, so we can learn from each other and improve our language together. I'm a easy-going person and (I look) <strike>looking</strike> forward to <strike>be</strike> (being) friend(s) with you.