1.He was busily engaged ______ writing letters.
2.Do remember to ______ the light when you leave the room.
A. turn up
B. turn on
C. turn off
D. turn down
3.The atmosphere consists of an ocean of gases ______ miles high.
B. hundreds of
C. of hundreds
D. of hundreds of
4.Not only the students but also the old teacher ______ been changed.
5.—— ________ I had!
—— You really suffered a lot.
A. What a time
B. What time
C. How a time
D. how time
6.The advertisements are trying ________ people to buy things they don‘t really need.
C. be persuading
D. to persuade
7.Practice ________ English every day.
B. to speak
8.The discount houses were first established in that period of time ________ people‘s purchasing power was low.
9.Please write a report ________ the above subjects are to be covered.
B. in which
D. in that
10.The reason ________ I‘m writing is to ask for your permission to translate your latest novel into Chinese.