23、After studying in a medical college for five years, Jane ______ her job as a doctor in the countryside.

A．set out          B．took over        C．took up       D．set up

22、Many people agree that_______ knowledge of English is a must in_______ international trade today.

A．a; 不填         B．the; an         C．the; the         D．不填；the

21、It’s strange that they _____ nothing about this matter.

A．should know          B．would know         C．had known            D．knew

20、Yesterday my teacher said to my father with much regret, “Should your son make what his

teachers teach _____, he would do much better in his studies.”

A．him        B．his       C．himself           D．them 

19、—Well, I forgot to bring my dictionary here yesterday.

—Oh, actually you___it here, for dictionaries were not allowed to use here yesterday.

A．needn’t bring                                            B．needn’t have brought      

C．didn’t need to bring                                   D．don’t have to bring

18、----What’s happened to George?

----I don’t know．He ________.

A．must have got lost                                             B．may have got lost

C．should have got lost                                           D．can’t be lost

17、The river beyond our school has become clean again as new measures are ______ to prevent it ______ any further.

A．taken; polluting                              B．taking; being polluted

C．taken; being polluted                          D．taking; to be polluted

16、–-Where did you put the car keys?

--Oh, I _______ I put them on the chair because the phone rang as I _______in.

A．remembered; come              B．remembered; was coming

C．remember; come               D．remember; was coming

15、You have no idea how she finished the relay race with her foot   so much.

A．to wound                B．wound           C．wounded            D．wounding

14、I don’t remember how many years ago ______ people began to grow crops.

A．it was when                B．it was that           C．was it when           D．was it that