I heard some noise outside , ______ I went out of the room to see what happened .
A. but
B. so
C. for
D. since
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I parked the car in front of the building ______ the car-park was full .
A. because
B. so that
C. unless
D. even if
There were busy and crowed people in the market at weekend ,_______it was snowy and cpld.
A. if
B. since
C. unless
D. thought
_______ you like extremely hot weather , avoid July and August .
A. If
B. Once
C. When
D. Unless
Great changes have taken place in Homg Kong ______1997
A. since
B. once
C. when
D. until