All possible means ______ to protect this kind of animals in danger up to now.
| A．have been tried | B．were tried |
| C．was tried | D．has been completed |
They must have been enjoying themselves there, otherwise they ________so long.
| A．can’t have stayed |
| B．wouldn’t have stayed |
| C．needn’t have stayed |
| D．couldn ’t stay |
Oh, I’m not feeling well in the stomach, I ________so much fried chicken just now.
| A．shouldn’t eat |
| B．mustn’t have eaten |
| C．shouldn’t have eaten |
| D．mustn’t eat |
________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
| A．To wait |
| B．Have waited |
| C．Having waited |
| D．To have waited |
---What do you mean ________ saying‘The boy is overgrowing’ ?
---I mean that he is tall ________ his age. (2013 .河北五校联盟调研)
| A．about; with |
| B．as to; for |
| C．by; for |
| D．by; to |
Few people have ever ________deep into this well, for it is extremely dangerous.
| A．risked going |
| B．tried to go |
| C．trys going |
| D．risked to go |