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. Only if we do enough self-protection, we stay away from Covid-19.
2. I’m working on my essay. Would you mind turn down your music a little bit?
3. Sometimes, I start the second declaration first and sometimes, I start the first declaration the second time.
4. Simon is such responsible a boy that he is chosen chairman of the Student Union.
5. As time going by, the virus will probably become weaker and less active.
6. We are still in the middle of 2020, that is considered to be an eventful year.
7. Apart from self-protection, we have no choice but wait for the vaccine.
8. To avoid be trapped in heavy traffic at the rush hour, I usually take the subway to work.
9. Henry became addictive to online games, which had a bad effect on his schoolwork.
10. Quite a lot of species have been died out so far, resulting from urbanization.
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：每处错误及其修改均仅限一词。
1. He is so selfless that he is thought high of by the neighbors.
2. This book, The Old Man and the Sea, is well worth read.
3. The Olympic Games are held every four year.
4. The project is in charge of an experienced worker.
5. It was your determination which changed my mother’s attitude to you.
6. He feels happy that the problem has solved at last.
7. As a result for his carelessness, he failed the exam.
8. I have some doubt in my mind that they will be glad to see me.
9. It is known to us all, the burning of any fuel requires oxygen.
10. These books were belonged to our school library.
During the
There is no doubt
