急~~~~帮忙解决一些英语题~~

用介词by,with和in填空。
I study for a test ____ working with a group

根据句意及首字母提示，补全句中所缺单词，使句子完整。
1.I think that the increasing population is one of the greatest c____ today.
2.Don't tell anyone about our plan.Keep it a s____.
3.There are many new words in the text,so I read very s____
4.The boy finds it difficult to make c____ sentences because he isn't good at grammer.
5.The beautiful soghts of the city i____ all the visitous.

用trouble，realize,later on,take notes,laugh at填空
1.I did't ____ how late it was.
2.You two go first. I'll go there ____.
3.It is impolite to ____ a person who makes mistakes in studying.
4.The techer asked me to ____ while he was speaking.
5.What't your ____, yaung man?

请各位高手保证正确率后再填写，谢谢各位~~~~~~~

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