It was so noisy that we hear ourselves speak.
A.couldn’t B.shouldn’t
C.mustn’t D.needn’t
he thought he was helping us with the work, he was actually in the way.
A.Although B.Unless
C.Because D.When
Before Tom left home, his mother kept telling him to _______ his manners at the party.
A.notice B.mind C.watch D.care
（2015·江苏）Much time ________sitting at a desk, office workers are generally troubled by health problems.
A.being spent B.having spent
C.spent D.spending
By reading the story, you may understand ______ to be successful.
A.it takes what B.you take what C.what takes you D.what it takes
Only if a teacher gives permission _________ to enter the room.
A.a student is allowed B.is a student allowed
C.does a student allow D.a student allowed
