1 . 下面每个句子都只有一处语言错误。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（^），并在其下面写出该词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下面划一横线，并在该词下面写出修改后的词。
1. He held out his hand to help her on her feet.
2. Someone grabbed him by his collar, and he thought they were going to help him up.
3. These experiments justify changed the normal method of work.
4. She made some purchase from the shopping mall.
5. The problem is due to discipline, or, more precise, the lack of discipline, in schools.
6. Man’s ability to reason sets him apart to other animals.
7. The purpose of the program is promote an open exchange of ideas and information.
8. This is just a small taste of what is in store with you in this exhibition .
9. For young people, there is a plenty of time to change bad habits.
10. It is necessary of you to memorize more words in the process of learning a language.

2 . 单句改错
1. Seeing from the top of the tower, the mountain is like a sea of trees.
2. By a coincidence, we arrived there at the same time.
3. The bad news made the people very disappointing.
4. The ball was in possession of their opponents for most of the match.
5. Apart from a few faults, he is a faithfully friend.