Our skin, if ______ to sunlight for a long time, can become darker.
| A．exposes | B．exposing |
| C．being exposed | D．exposed |
We ________ have bought so much food now that Suzie won't be with us for dinner.(2012·江西)
| A．may not | B．needn't | C．can't | D．mustn't |
—Happy birthday!
—Thank you！It's the best present I ________ for.(2012·江苏)
| A．should have wished | B．must have wished |
| C．may have wished | D．could have wished |
If you don't want to go swimming，you ________ as well stay at home.Actually，it is up to you to decide.
| A．should | B．would | C．can | D．may |
I ________ thank you too much for all your help to my son while we were away from home.
| A．won't | B．can't | C．can | D．will |
It ________ be the postman at the door.It's only six o'clock.
| A．mustn't | B．can't | C．won't | D．needn't |