Helen is much more kind to her youngest child than to the others,___________ of course, make the others unhappy.
| A．who | B．which | C．she | D．that |
Wolves are very __________：they can live in forests, on open plains, or in the snows of the Arctic.
| A．adaptable |
| B．adoptable |
| C．available |
| D．accessible |
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 |