Most of the fresh water is ______ at the North and South Poles.
A.flowed
B.boiled
C.run
D.frozen

China is one of the most ______ populated areas in the world.
A.perfectly
B.completely
C.wastefully
D.

Like many other baby birds, ducklings are blind _______ birth.
A.of
B.on
C.at
D.from

The rapid growth of population led to an acute _______ of housing.
A.shortfall
B.shortage
C.shortcoming
D.shortcut

One third of the world's population _______ two thirds of the world's resources.
A.
B.consumes
C.absorbs
D.

Choose the word which is stressed differently from the rest.
A.average
B.method
C.decrease
D.resource

Choose the word which is stressed differently from the rest.
A.injury
B.expert
C.limit
D.control

Choose the best word/phrase to complete the sentences.People are not aware ______ the problem of overpopulation.
A.for
B.at
C.in
D.of

Scientists say that the main reason ______ population explosion is an increase in birth rate.
A.of
B.in
C.for
D.to

The second solution is to provide safe, ______ birth-control methods.
A.inexpensive
B.expensive
C.inexpensively
D.expensively