A group of young Americans have come to Beijing for a visit. Half of them, ___is, 50 persons, can speak Chinese fluently.
| A．that | B．which | C．who | D．it |
—Waiter!
—
—I can’t eat this. It’s too salty.
| A．Yes, sir? | B．What? |
| C．All right? | D．Pardon? |
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A．when | B．since | C．because | D．unless |
______ I had done it I knew I had made a mistake.
| A．Hardly | B．Directly | C．Mostly | D．Nearly |
Elbert Einstein, for ______ life had once been very hard, was successful later in science .
| A．whom | B．whose | C．which | D．his |
You are really very kind. I’ll never forget the you have done to me.
| A．favour | B．deed |
| C．help | D．good |