6 . 单句改错
注意：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。
1. We ought to be strict with ourselves in everything we do it at school.
2. The professor preferred giving lectures to students to attend meetings at times.
3. So heavy was the rain that we had to take shelter against it in the supermarket.
4. I am sorry to know that you feel stressful as a high school freshman.
5. As we know, being addicted to online games does damages to our health.
6. After the accident, he kept calm as if nothing happened to him.
7. We will have some experts by hand to give you any help you need at all times.
8. I am writing to let you know how much I appreciate your help my son Robert last Thursday when he injured his leg.
9. No matter what background you come from, you can be equal successful with your hard work like many others.
10. The study of a modern language has an unique contribution to the development of cultural awareness.