1 . China has_________ population of 1.4 billion, 80 percent of whom________ asked to stay at home during the epidemic (疫情) of coronavirus.

A．a; was

B．/; was

C．a; were

D．the; were

2 . Chinese visitors were the highest-spending group visiting Switzerland, where they spent ______ average of 380 Swiss francs ($425) per person per day, according to Switzerland Tourism.

A．/

B．an

C．the

D．on

4 . 单句改错
1. My son, who is a 18-year-old young man, now is a university student.
2. We may be one family and live under a same roof.
3. The production now is four times that it was ten years ago.
4. The experiment was much more easier than we had expected.
5. He had an astonishing look on his face when he heard the news.
6. It becomes the colder and colder when winter comes.
7. The old man caught the boy by his arm.
8. These documents are not accessible by the public.
9. He studied hard every day, aimed at passing the exam.
10. About 80 percent of web traffic are in English.