D.is listening

9.“your best?It’s not satisfactory.I’m afraid yowill have to do it again.”

A.Do yotry

B.Have yotried

C.Are yotrying

D.Have yobeen trying

10.Chinese married couple red packets to children and the unmarried during the Chinese New Year.

A.give

B.have been giving

C.are giving

D.have given

11.This is the first time the students to Hyde Park.

A.have gone

B.have been gone

C.have been going

D.are being gone

12.We have sometimes accidents on this line,but no accidents since last winter.

A.occur

B.have occurred

C.have been occurring

D.are occurring

13.careless,or yowill make mistakes.

A.Be not

B.Not be

C.Don’t

D.Don’t b e

14.Everything on the earth all the time.

A.is changing

B.is changed

C.has changed

D.has been changed

15.By the end of last year they 1,000 machines.

A.turned out

B.had turned out

C.would turn out

D.had been turned out

16.The teacher suggested that each student a plan for the vacation.

A.made

B.make

C.makes