_____ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.
| A．Tiring; to admire | B．Being tired; admiring |
| C．Tired; to admire | D．Tired; admiring |
It suddenly occurred to him __________ he had left his keys in the office.
| A．whether |
| B．where |
| C．which |
| D．that |
—Do you think their table tennis team will win the first place at the coming Asian Games?
—__________. Ours is much stronger than theirs.
| A．Of course |
| B．It depends |
| C．Don't mention it |
| D．By no means |
The death rate is __________ pigs and recovery usually __________ within 7—10 days.
| A．low in; occurs |
| B．rich in; happens |
| C．high in; came about |
| D．poor in; took place |
__________ is certain is __________ prevention is more important than treatment.
| A．It; that |
| B．What; that |
| C．As; what |
| D．What; what |
I asked him __________ we had to go. He told me just two more miles.
| A．how much longer |
| B．how much farther |
| C．how long |
| D．how far |