From his expression, I don’t think he could have finished his homework last night, _______?
| A．couldn’t he | B．do I |
| C．did he | D．hasn’t he |
_____ the flight to Beijing will be delayed is _______ I’m especially worried about.
| A．If; what | B．Whether; that | C．When; that | D．Whether; what |
I think you need some outdoor exercise. Plenty of fresh air will______ good health.
| A．contribute to | B．devote to | C．apply to | D．adjust to |
To tell the truth, if it were not for the fact that you______ my daughter, I would not take such pains to serve you.
| A．were | B．are | C．had been | D．have been |
In the end, we got to the situation ____ we had to take immediate action to save the wounded.
| A．where | B．when | C．how | D．whether |
I can’t imagine therebe a shortage of water in Yunnan, the southwest of China where there used to be adequate (充足的) rain .
| A．could | B．must | C．can | D．should |