______from space, the earth, with water _____seventy percent of its surface looks like a blue ball.
| A．Seen; covered | B．Seen; covering | C．Seeing; covered | D．Seeing; covering |
With no more wood added to the fire, it finally died __________.
| A．away |
| B．down |
| C．out |
| D．off |
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 |