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B：If
C：As
D：While
the war，a new school building was put up____ there had once been a theatre.
A：that
B：where
C：which
D：when
he took part in the competition, he won a second prize.
A：For the first time
B：At a time
C：At one time
D：The first time
would appreciate it____ you call back this afternoon for the doctor’s appointment.
A：until
B：if
C：when
D：that
had just started back for the house to change my clothes____ I heard the voices.
A：as
B：after
C：while
D：when
class went on with the story____ they had left it before the holiday.
A：where
B：which
C：in which
D：when
company has a free long-distance telephone number____ customers may call with any questions they have about its products.
A：although
B：as
C：even if
D：so that
17.--- Is Mr. Smith in the office?--- Yes，____ he is in charge of the office，he must be there.
A：since
B：however
C：whether
D：for
called me up in the middle of the night，but they hung up____ I could answer the phone.
A：as
B：since
C：until
D：before
19.--- Don’t look down upon Bob. He has his own advantages.--- Oh, others are weak, he is strong.
A：If
B：When
C：Where
D：Though
day must be breaking,____ the birds have begun singing.
A：because
B：as
C：for
D：since
you are little, the whole world feels like a big playground. I was living in Conyers, Georgia the summer it a