I. 单项选择（共25小题，每小题1分，满分25分）
The hurricane happened on _____ Sunday morning last month and did ____ lot of damage to the province.
| A．/;/ | B．a; a | C．a; / | D．the; a |
---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
| A．did | B．has done | C．was doing | D．had done |
In ________ most countries, a university degree can give you _________ flying start in life.
| A．the; a | B．the ; / | C．/ ; / | D．/; a |
It is the first time that Martin has been to the South Pole, ________?
| A．isn’t he | B．hasn’t he | C．isn’t it | D．hasn’t it |
If it _____ for the heavy rain then, we would have arrived here ahead of time.
| A．shouldn’t be | B．weren’t | C．had not been | D．be not |
We should protect the environment, for plenty of fresh air ________ to good health.
| A．adjust | B．contributes | C．distributes | D．appeals |