There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
| A．since | B．if |
| C．as | D．while |
He has behaved in the most extraordinary way; I can’this actions at all.
| A．account for | B．call for | C．send for | D．reach for |
----Why did you leave without a word of warning to John?
----But whatotherwise? He never listens to me.
| A．must I have done | B．should I do |
| C．could I have done | D．would I do |
You’ll have to pay an extra amount tothe cost of insurance.
| A．cover | B．spend | C．fill | D．offer |
It’s said that there are plenty of hotels here .Therebe any difficulty for you to find somewhere to stay.
| A．mustn’t | B．needn’t | C．wouldn’t | D．shouldn’t |
The school advisers help you talk through your problem but they don’t give you any direct.
| A．solution | B．target | C．measure | D．function |