You mustn't drive a car on the road____ you get a driver's license. ( )
A.unlessB.ifC.since
David,look at the man in black over there.Can you tell me ____________?
He is an engineer.( )
A.who is heB.who he is
C.what he does
I feel upset because I am too heavy.
____________ do more exercise to lose some weight?( )
A.Why don'tB.Why notC.Why not to
Mrs.White,can I leave my homework for tomorrow?
I'm afraid not.Don't ___________what you can do today till tomorrow.( )
A.put offB.get offC.take off
Mum,I'm going climbing.Must I clean the room now?
No,you_____________.You can do it this evening.( )
A.can'tB.mustn'tC.needn't
Look! A woman with three children____________ crossing the street.
Let's help them.( )
A.isB.areC.was