—Tom often drives carelessly.
—Tell him he ________ answer for it if he goes on behaving like that.
A．shall B．should C．will D．must
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
—Where will you start your work after graduation?
—Mum，it's not been decided yet.I ________ continue my study for a higher degree.
A．need B．must C．would D．might
