_____ on a clear day, far from the city crowds, the mountains gave him a sense of peace.
| A．If walking | B．While walking | C．Walking | D．When he was walking |
It was already one in the morning, and my candle was nearly burnt out, _____ I saw the dull yellow eyes of the creature open.
| A．when | B．that | C．where | D．how |
Under more favourable conditions, we _____ better
| A．need have done | B．should do | C．could have done | D．might be doing |
Estuaries provide both recreation and education for human beings. They also _____ the economy through tourism and fishing.
| A．contribute to | B．adapt to | C．respond to | D．apply to |
For more than a hundred years black people had to fight ______ the rights to vote, choose where to live, study and work.
| A．to give | B．to be given | C．giving | D．being given |
We have just heard the news that the experts are_____to go to Qinghai Province to investigate the possible damage caused by the serious earthquake
| A．probable | B．possible | C．perhaps | D．likely |