1 . 增加：在缺词处加一个漏字的符号（∧），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：每处错误及其修改均仅限一词。
1. The guides were naturally willing to go alone and seek a way out of difficulty, so we all went together.
2. You may depend on that it won’t happen again.
3. Concentrated your attention on English will enable you to master the language.
4. We have a lot in common, that is because we can cooperate.
5. The number of endangered species are on the increase.
6. Parents nowadays are aware about the importance of children’s education.
7. More and more material possession do not suggest that you gain more happiness.
8. It is such a honor to take part in the celebration, so how could I make any mistakes?
9. The mosquitoes annoyed me very much that I couldn't sleep.
10. The concert was constructed by your cousin last night was really a great success.