1 . 每句一处错误, 每处错误仅涉及一个单词的增加、删除或修改。
增加: 在缺词处加一个漏词符号（^）, 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: 在错的词下面画一横线, 并在该词下面写出修改后的词。
1. He kept concentrating in the same topic since he was a stubborn person.
2. I prefer writing a term paper than taking an examination
3. Another time five months ago, I happened to be upstairs at dusk when the window open.
4. India has a largest number of fluent English speakers.
5. He can’t forgive him for not seeing his mother before she died.
6. You must listen carefully and follow that teachers said.
7. It is not easy to quit smoke cigarettes.
8. Some puzzles look difficult but are actual quite simple.
9. I was frightening on my first day of classes at an American university.
10. I sat quietly on myself.

6 . The Shanghai-Suzhou-Nantong Yangtze River Bridge opened to traffic in July, 2020, which is an ___________ (令人惊奇的) and challenging engineering project.(根据汉语提示单词拼写)