21、Morning exercises are good for our health.

Morning exercises are ______ ______ to our health. 

20、She _________ Robert for a year.

A. married          B. married with     C. has been marrying     D. has been married to

19、_____about the apes, he didn’t leave his food at the place they could easily reach.

A. Warning        B. To warn         C. Having warned              D. Having been warned

18、Do you mind ________ alone at home?

A. the daughter leaving                  B. the daughter’s being left

C. the daughter having left             D. the daughter to be left

17、More than one student ________ sent to the hardest place since 1979.

A. is           B. are               C. has been                D. have been

16、_______ was known to all that the boss had broken his promise _______ he would give the workers a rise.

A. What, that                B. As, which                 C. It, that                 D. It, which

15、As a result of the accident, he was ________ from driving for two years.

A. qualified       B. qualifying     C. disqualifying         D. disqualified

14、 Jack __________ yet, otherwise he would have telephoned me.

A. mustn’t have arrived                    B. shouldn’t have arrived

C. can’t have arrived                        D. needn’t have arrived

13、_____ is mentioned, the number of the students in colleges is increasing these years.

A. It                     B. As             C. Which               D. That