A: What’s the matter, Sara? You wear a sad look on your face.
B: Oh, nothing much. As a matter of fact, I _______ of my friends back home.
| A．just thought | B．have just been thinking |
| C．was just thinking | D．have just thought |
Such animals like dinosaurs died out because they couldn't __________ to the change of the climate.
| A．suit |
| B．keep |
| C．adapt |
| D．switch |
Little Tom easily __________ himself to the American life as he moved to the USA with his parents when he was only three.
| A．suited |
| B．adapted |
| C．matched |
| D．fitted |
The room is in a terrible mess; it __________ have been cleaned.
| A．can't |
| B．mustn't |
| C．shouldn't |
| D．wouldn't |
-Tom almost ran into a pole yesterday while driving on the highway.
-I suppose he __________ too fast.
| A．had driven |
| B．was driving |
| C．must drive |
| D．should have driven |
-Guess what! I have got an A for my term paper.
-Great ！ You __________ read widely and put a lot of work into it.
| A．must have |
| B．should |
| C．must |
| D．should have |