Hiking is ______ great fun. You will get close to ______ nature and take exercise at the same time.
| A．a; the | B．a; ／ | C．／; the | D．／; ／ |
If he takes on this work, he will have no choice butan even greater challenge.
| A． | meets | B． | meeting | C． | meet | D． | to meet |
—The trip shouldn’t take more than an hour.
—_______.it is at least two hours.
| A．I guess so | B．That’s it |
| C．You must be joking | D．It depends |
As many as five courses are provided, and you are free to choose ______ suits you best.
| A．whatever | B．whichever | C．whenever | D．wherever |
He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system.
| A． | broke in | B． | broke up | C． | broke out | D． | broke down |
Hot _______the night air was, we slept deeply because we were so tired after the long journey.
| A．although | B．as | C．while | D．however |