—Are you coming to Jeff's party?
—I'm not sure.I ________ go to the concert instead.
| A．must | B．would | C．should | D．might |
—Could I borrow your dictionary?
—Yes，of course you ________.
| A．could | B．will | C．can | D．might |
He ________ your car by mistake because he didn't have the keys.
| A．mustn't have taken | B．shouldn't have taken |
| C．couldn't have taken | D．needn't have taken |
—The similarities between social networks are striking.
—That ________ come as no surprise，because they are all products of the Internet.
| A．should | B．shall | C．may | D．must |
—Hi，Joan.Any idea where Tom is?
—He ________ on the playground.I saw him there playing football just now.
| A．shall be | B．should have been |
| C．must be | D．might have been |
—Guess what？I came first in that contest.
—Great！You ________ a lot during the past two weeks.
| A．must practise | B．should practise |
| C．should have practised | D．must have practised |
—I didn't go to see the doctor yesterday.
—But you ________.
| A．ought | B．ought to |
| C．ought to be | D．ought to have |
(2013·新课标Ⅰ，29)The door________open，no matter how hard she pushed.
| A．shouldn't | B．couldn't | C．wouldn't | D．mightn't |
(2013·天津，9)No one________ be more generous；he has a heart of gold.
| A．could | B．must | C．dare | D．need |
(2013·四川，5)—Why are your eyes so red？You________have slept well last night.
—Yeah，I stayed up late writing a report.
| A．can't | B．mustn't | C．needn't | D．won't |