When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．
| A．asked | B．being asked | C．having asked | D．asking |
—I’d love to make friends with the boy ____ you think is easy to _____.
—OK. I’ll introduce you to him at the party.
| A．who; get on with him | B．whom; get on with |
| C．whom; get on with him | D．who; get on with |
I soon found that the work I was doing ____ by someone else — in other words, I was wasting my time.
| A．had already been done | B．has already been done |
| C．would be done | D．have already been done |
Jim won the award, _______ excited everybody in the class.
| A．which | B．that | C．this | D．it |
The reason ______ he gave for being late was ______ he overslept this morning.
| A．why; that | B．which; that | C．why; because | D．which; because |
In class the teacher’s humorous words often make every student ____ laughter.
| A．burst into | B．break into | C．fall into | D．come into |