(And Please pay attention "卖的-好" is different than "卖的好" the former means the good quality of the merchandise and the latter means "it sells well") 6. When you came back at home , tell my sister i will come back later this evening , ask her to not be worry, 你回家了告诉我妹妹我晚点再回来，告诉他不用担心. ("你"shouldn't be used twice,but there's no much fuss,just ignore it if you don't care much.) 7. Who are two girls that have just entered from outside ? 刚才那两个进来的姑娘是谁？ (First again,article and there's a mistake of sentence order) 8. In this building many elders live : when they heart that a young foriegners` couple relocated here , they all became very happy. 8. 在大楼里住着很多老人：他们听到（or "被告诉" but don't use this form,it sounds strange）了一对外国的青年搬迁这里来的时候，他们都很高兴。(Without"了",can't really explain why) 9. Please , enter here in my room , give me back the book that i borrowed from library , then go down and buy some eggs for me. 请进我的房间来,把我从图书馆借来的书还给我，再去楼下帮（"帮"or "给" it depends on the mood of the speaker）我买几个鸡蛋。

Dude,you have no idea of "article"

1. I`ve just put in big drawer all the things bought yesterday evening in mall. 我刚（you can also use "已经" but it is a little different）把昨天在商场买的东西都放到那个大抽屉里了 （You've alse made a few mistake in English,eg" a big drawer",you forgot the article） 2. New dress I bought last week in Canada is not prettier than the old dress i saw the day before yesterday at your home. 我上个星期在加拿大买的新裙子没有我前天在你家看到的旧的好看。 （Also the article,"The new dress"） 3. Chinese`s level of students that everyday do homeworks goes better more and more . 中国学生做语文作业的水平越来越好。（When refered to a school subject we don't say "汉语" but instead, "语文".And dude,you have a logical error.are you tring to say “Student's Chinese level in doing homework go(plural) better and better”?Anyway, I could make mistakes in Englisch,I'm not a native speaker.） 4. Chinese girl sings better than german one. 中国女孩歌唱的比德国的更好. (Again,artical，"A Chinese girl or Chinese girls" and the sentence you translated is not wrong, but we say it in this form more often. ) 5. Usually , fruit bought at market is less good than the one that farmer which live near my friend`s house sells. 一般来说，在市场买的水果没有在我朋友家旁边的农民卖的好。 （I can see there's something wrong in your Englisch sentence but well,you know, maybe it shouldn't be me to correct it.）

there are mistakes in every sentence... all i can say is "don't write long sentences before you can write correctly the short ones"