單項(xiàng)選擇題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.單項(xiàng)選擇題Attendance at football matches have（）since the coming of television.

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

2.單項(xiàng)選擇題The engine has broken and the boat is（）on the water.

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

3.單項(xiàng)選擇題The terrible noise is（）me mad.

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

4.單項(xiàng)選擇題Let's drink（）Dicks' success in business.

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

5.單項(xiàng)選擇題The student found the novel（） It provided him with so much information about the subject.

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

7.單項(xiàng)選擇題（）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.單項(xiàng)選擇題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.單項(xiàng)選擇題We must（）that the experiment is controlled as rigidly as possible.

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

10.單項(xiàng)選擇題Be careful,（）you'll fall down.

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