—May I smoke here?
—Choose a seat in the smoking section, if you ________.
A．should B．must C．can D．may
---Would you like to go out for a walk?
---- ．
A．No,but I can’t afford the time
B．No,I don’t feel in the mood for it now
C．You may ask your sister to go,too
D．No,thank you
As a result of the serious flood,two-thirds of the buildings in the areas ．
A．need repairing B．need to repair
C．needs repairing D．needs to repair
All of the children ______ in the school play and they are in high spirits.
A．are involving B．involve
C．are involved D．have involved
______ no bus, we had to walk home.
A．There was B．There being
C．Because there being D．There were
During the rush hour they were in the heavy traffic．
A．held on B．held up
C．held down D．held out
