_____the teacher couldn’t understand was _____ fewer and fewer students showed interest in his class.
| A．What; that | B．All that; because |
| C．Why; that | D．What; why |
Darwin counted 225 flowering plants, ______ he collected and brought home 193.
| A．which | B．for which | C．in which | D．of which |
He came to my class every week, but his attitude _______he was not really interested in the subject.
| A．expressed | B．described | C．explained | D．suggested |
Why didn't you tell me there was no meeting today? Iall the way here through the heavy snow.
| A．needn't have driven | B．can't have driven |
| C．mustn't have driven | D．shouldn't have driven |
The old man, _______ abroad for twenty years , is on the way back to his motherland.
| A．to work | B．working | C．to have worked | D．having worked. |
Zheng He’s first stop during the expedition was in _______ is a part of Vietnam today.
| A．where | B．what | C．which | D．that |