—What a pity! Their experiment is a failure.
—They ________ better under more favorable conditions.
| A．should have done | B．could have done | C．must have done | D．may have done |
____________ breaks his promises will not be trusted by his friends.
| A．Who | B．Anyone | C．Those | D．Whoever |
I promised to get there before 5 o’clock, but now the rain is pouring down. They _______ for me impatiently.
| A．may wait | B．ought to wait | C．could wait | D．must be waiting |
What award did you get for the sports competit
ion? ___________ I have a look?
| A．May | B．will | C．Should | D．Must |
Mr. Stanton became _____ of the _____ speech, so he began to read a novel.
| A．tired, boring | B．tiring, bored | C．tired, bored | D．tiring, boring |
Only when class began _____ that he had left his book at home.
| A．will he realize | B．he did realize | C．did he realize | D．should he realize |