——You didn’t wait for Mr. Black last night, did you?
——No, but we ____. He didn’t return home at all.
| A．couldn’t have | B．needn’t have | C．didn’t need to | D．should wait have |
How can you know whether you will succeed ______ you never try?
| A．in case | B．when | C．unless | D．even if |
It was the fifth time that he ______ to such a meeting.
| A．have been invited | B．was invited | C．had invited | D．had been invited |
The villagers, ______ damaged by the flood, were given help by the International Red Cross.
| A．all whose houses | B．all their houses | C．all of whose houses | D．their all houses |
. It is necessary that whoever ______ recently visited the country ______ this kind of test.
A．h as; pass |
B．has; passed | C．have; pass | D．has; passes |
His composition won first prize, ______ made him too happy to sleep for nights.
| A．what | B．that | C．which | D．where |