________swallow（燕子）doesn’t make ________ summer.
| A．One; a | B．One ; ／ |
| C．A; the | D．A; ／ |
—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 |
How close parents are to their children ________ a strong influence on the development of the children's characters.
| A．having | B．had |
| C．has | D．have |
—Was it at 11 o'clock ________ your father came back last night?
—Yes, he is always coming back so late.
| A．that | B．while |
| C．when | D．until |