________ in Tibet for ten years, he has been accustomed to the life and the climate there.
| A．He has worked | B．Having worked |
| C．He has been working | D．Working |
The weather turned out to be fine yesterday. I the trouble to carry my umbrella with me.
| A．should have taken |
| B．could have taken |
| C．needn’t have taken |
| D．mustn’t have taken |
Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.
| A．can; have to |
| B．may; can |
| C．have to; may |
| D．ought to; must |
--- Must he come to sign this paper himself?
--- Yes, he.
| A．need |
| B．must |
| C．may |
| D．will |
The workers will go on strike if the demands they ____put forward are turned down.
| A．could |
| B．would |
| C．不填 |
| D．had |
I’m sure you’d rather she went to school by bus, _______?
| A．hadn’t you |
| B．wouldn’t you |
| C．aren’t you |
| D．didn’t she |