假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加，删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）．每处错误及其修改均仅限一词；

2）．只允许修改10处，多者（从第11处起）不计分。

    Keeping a diary in English is the effective way to improve our English writing ability．

    First, it takes little time to finish a diary than other writings．By keeping English diaries, we can easy form the habit of thinking about in English．

    Second, we can practice use English idioms and useful structures in our diary-writing．If we have difficulty finding suitable words or phrases to express our opinion, we can turn in English dictionaries or teacher for help．This is also a kind of learning．If we can keep on doing this, we would gradually learn how express ourselves in English freely．

    In a word, it was of great benefit to keep diaries in English．

一个质量为2kg的物体静止在光滑的平面上，在6N的水平恒力F的作用下开始运动，求：

显微镜下所要观察的材料一定要____．

每处错误仅涉及一个单词的增加、删除或修改。

①In addition, sometimes I am very clumsy and drop things or bump into furnitures.

②Pudong Development Zone is no longer that it used to be.

③The capital of Peru is Lima, that is in the north on the coast.

④But monitoring carefully, the snakes proved to be no trouble and all went according to plan.

⑤Would you like to introduce your new published book to us?

⑥They urged that the gym was kept open during the work time.

⑦I came up this book in an old bookstore several days ago.

⑧Mum can't have Peter stay up all night long.

⑨Just accept them for who they are, and give them encouragement to live as rich and full life as you do.

⑩Every time when I returned after an absence, I felt stupid because I was behind the others.