The schoolboy _________to the blind man on his Way home yesterday afternoon．
A.apologizes B.apologized C.will apologize D.has apologized
Look，so many passengers__________ with their smart phones on the underground．
A.played B.will play C.are playing D.have played
I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
A.because B.though C.until D.unless
Which do you prefer to use to keep in touch with your friends，QQ__________MSN?
A.and B.but C.or D.so
The volunteer spoke as__________ as she could to make the visitors understand her．
A.clearly B.more clearly C.most clearly D.the most clearly
— Must I go to medical school and be a doctor like you，Dad?
— No，you__________，son．You’re free to make your own decision．
A.can’t B.mustn’t C.shouldn’t D.needn’t
