单项选择题Each year in the United States, many black teenagers()of school, either because they cannot keep up or they have to work to support their family.

A.go out
B.drop out
C.check out
D.pull out


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1.单项选择题Attendance at football matches have()since the coming of television.

A.dropped in
B.dropped off
C.dropped out
D.dropped down

2.单项选择题The engine has broken and the boat is()on the water.

A.flowing
B.floating
C.drifting
D.sailing

3.单项选择题The terrible noise is()me mad.

A.turning
B.setting
C.driving
D.putting

4.单项选择题Let's drink()Dicks' success in business.

A.of
B.for
C.to
D.with

5.单项选择题The student found the novel() It provided him with so much information about the subject.

A.enlightening
B.confusing
C.frustrating
D.delighting

7.单项选择题()with the size of the whole earth, the highest mountains do not seem high at all.

A.If you compare
B.Compare them
C.When compared
D.A comparison

8.单项选择题It is useful to science()the earth as an object in space.

A.to consider
B.which considers
C.considers
D.the consideration of

9.单项选择题We must()that the experiment is controlled as rigidly as possible.

A.assure
B.secure
C.ensure
D.issue

10.单项选择题Be careful,()you'll fall down.

A.on the contrary
B.or rather
C.or else
D.as for