Though he studies very hard, ______ his English is not good.
| A．but | B．and | C．/ | D．so |
I saw them _____ basketball at this time yesterday.
| A．play | B．played | C．to play | D．playing |
John _____ go there with us tonight, but he isn’t sure about it.
| A．must | B．can | C．will | D．may |
You must ______ your cigarette when you are at the gas station.
| A．put down | B．put on | C．put off | D．put out |
Her grandparents are still in good health ______ they are over eighty.
| A．though | B．as soon as | C．until | D．because |
China lies _____ the east of Asia and _____ the north of Australia.
| A．to；to | B．in；to | C．to；in | D．in；on |