______ Jack ______Tom has been to America . We know little about America .
A. Not only ;but also
B. Either ; or
C. Neither ;nor
D. Both ;and
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I must be off now , _______ the train will start in ten minutes .
A. while
B. so
C. for
D. but
There is no class tomorrow ______ you needn't get up early .
A. since
B. so
C. for
D. but
I heard some noise outside , ______ I went out of the room to see what happened .
A. but
B. so
C. for
D. since
I parked the car in front of the building ______ the car-park was full .
A. because
B. so that
C. unless
D. even if