( ) 1．--- Look! The man standing there is Mr Green.
--- It _______ be Mr Green. He has gone to England.
A．can’t B．mustn’t C．may D．would
( )2．--- I think teenagers should be allowed to go out with their friends at night.
--- ________. It’s not safe enough.
A．I disagree B．I think so C．I agree D.I don’t know
( )3．--- What ______ we do if we had a million dollars?
--- That’s only a dream.
A．must B．would C．will D．do
