You should eat lots of _______, because it’s good for your health.
| A．fish | B．vegetable | C．meat | D． fruits |
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 |