A. might            B. had to            C. should          D. ought to

19. What she couldn’t understand was ___________ fewer and fewer students showed interest in her lessons.

A. why             B. what               C. because          D. that

20. —Have you got the solution to the problem yet?

—No, it ___________. Hopefully we’ll get a result tomorrow.

A. was discussed                             B. has been discussed

C. had been discussed                        D. is being discussed

21. I was really anxious about you. You ___________ have left home without a word.

A. mustn’t            B. shouldn’t           C. couldn’t          D. needn’t

22. The earth became so violent that it was not clear ___________ the shape would last or not.

A. if                B. how               C. whether          D. why

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