21Mary made coffee（）her guests were finishing their meal .
A.so that
B.although
C.while
D.as if
开始考试练习点击查看答案22The little boy won't go to sleep（）his mother tells him a story.
A.or
B.unless
C.but
D.whether
开始考试练习点击查看答案23The old man asked Lucy to move to another chair（）he wanted lo sit next to his wife.
A.although
B.unless
C.because
D.if
开始考试练习点击查看答案24I had just stepped out of the bathroom and was busy drying myself with a towel（）I heard the steps.
A.while
B.when
C.since
D.after
开始考试练习点击查看答案25Because of the heavy traffic, it was already time for lunch break.（）she got to her office.
A.since
B.that
C.when
D.until
开始考试练习点击查看答案26John thinks it won't be long（）he is ready for his new job.
A.when
B.after
C.before
D.since
开始考试练习点击查看答案27The girl had hardly rung the bell.（）the door was opened suddenly, and her friend rushed out to greet her.
A.before
B.until
C.as
D.since
开始考试练习点击查看答案28We won't keep winning games（）we keep playing well.
A.because
B.unless
C.when
D.while
开始考试练习点击查看答案29Animals suffered at the hands of Man（）they were destroyed by people to make wayfor agricultural land to provide food for more people.
A.in which
B.for which
C.so that
D.inthat
开始考试练习点击查看答案30I thought we'd be late for the concert,（）we ended up getting there ahead of time.
A.but
B.or
C.so
D.for
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