17．－I didn't pass the English exam.
－Work hard, _______you'll succeed.
| A．and | B．but | C．or | D．So |
There is so much rain on the island that its annual rainfall reaches ________.
| A．sixty inches as much as |
| B．as sixty inches much as |
| C．as much as sixty inches |
| D．as much sixty inches as |
Look! The ground is wet. It must have rained last night, ________？
| A．hasn't it | B．hadn't it |
| C．mustn't it | D．didn't it |
—Did you tell her the bad news?
—Yes, but I'd rather ________.
| A．didn't | B．not |
| C．not have | D．hadn't |
He is only too ready to help others, seldom, ________， refusing them when they turn to him.
| A．if never | B．if ever |
| C．if not | D．if anything |
A recent study has found that the number of smokers ________ sharply over the past five years.
| A．is increasing |
| B．are increasing |
| C．has been increasing |
| D．have been increasing |