Tom says he ______ you and is helping you with the research at present.
| A．had called on | B．will call on |
| C．has called on | D．called on |
You_____getdownthebusuntilthebushasstopped.
| A．can’t | B．needn’t | C．mustn’t | D．don’t |
_____youfetchmesomehotwater?
| A．Can | B．May | C．Must | D．Might |
You_____tothemeetingthismorningifyouhavesomethingimportanttodo
| A．needn’ttocome | B．don’tneedcome |
| C．don’tneedcoming | D．needn’tcome |
Asphysicsishardenough,I_____studyit.
| A．amnotable | B．couldn’t | C．amnotableto | D．cannot |
TheyaskedTomtogivehimadrink,buthe_____.
| A．hadn’t | B．wasn’t | C．wouldn’t | D．could |