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