1 . —What were you doing at 2 o'clock yesterday afternoon?
—I was playing ________ football.

A．a

B．the

C．an

D．/

2 . 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.

3 . The enemy took ________ control of the city. In other words, all the city was under ________ control of the enemy.

A．the; the

B．the; /

C．/ ; the

D．a; the

4 . The woman who used to be in ________ charge of a big company is in ________ charge of a nurse at present.

A．the；不填	B．the；the
C．不填；不填	D．不填；the

5 . --Why not take ________ umbrella? It is raining.
--What________ good advice!

A．a ; an

B．an ; a

C．an ; /

6 . Environmental pollution is ________ threat to ________ man.

A．∕, a

B．∕, the

C．a, /

D．a, a

7 . Because he has been out of ________ work for months, the young man now depends on his parents for ________ living.

A．不填; a

B．the; a

C．不填; 不填

D．the; 不填

8 . Most people believe that _________knowledge is power and that having _______ good command of a foreign language is of great importance .

A．/ , a	B．the , a
C．/ ,   /	D．/,   the

9 . Tom is going to Xingyi by________plane.

A．a

B．an

C．the

D．/

10 . It is well-known that ________ year 2020 saw many developments in ________ science and technology, with those in the field of space science being particularly notable.

A．/; /

B．/; the

C．the; the

D．the; /