30. -- Why you be talking so loudly while others are studying?-- I am terribly sorry.
Michael______be a policeman, for he’s much too short.
Peter______come with us tonight, but he isn’t very sure yet.
The fire spread through the hotel very quickly but everyone_____get out.
Johnny, you_____play with the knife, you_____hurt yourself.won’t/can’t B.mustn’t/may C.shouldn’t/must D.can’t/shouldn’t
—Could I call you by your first name? —Yes, you______