Can you explain ____ most deserts are located near the west coast of the continents?
| A．why is it that | B．why it is that |
| C．how it is that | D．how is it that |
It_____we had stayed together for several weeks_____ I found we had a lot in common.
| A．was until; when | B．wasn’t until ; that |
| C．wasn’t until; when | D．was until; that |
You_____ all those calculations! We have a computer to do that sort of thing.
| A．needn’t have done | B．must not have done |
| C．shouldn’t have done | D．can not have done |
—_____I stay with you?
— Well, I would rather you_____me alone for a while.
| A．Will; leave | B．Shall; leave | C．Will; left | D．Shall; left |
Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.
| A．appreciated | B．approached | C．appointed | D．agreed |
China is a peace-loving country and _____no circumstances _____ first use nuclear weapons.
| A．on; will China | B．on; China will |
| C．under; will China | D．under; China will |