Construction of the railways helped to develop the national （） of Tanzania and Zambia.

单项选择题Take it（）It is nothing but a joke.

A.easy
B.easily
C.serious
D.seriously

单项选择题I'm（）to graduate in the next half of the year.

A.owing
B.thanks
C.due
D.because

单项选择题When I came through the customs at the airport, I had to pay（）on a clock I had bought.

A.taxes
B.duty
C.fines
D.fees

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

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

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

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

单项选择题The terrible noise is（）me mad.

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

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

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

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

单项选择题A baby might show fear of an unfamiliar adult,（）he is likely to smile and reach out to another infant.

A.if
B.wherever
C.so that
D.whereas