單項選擇題Sixty million people who()in rural areas are moving to cities every year.

A.lived
B.lives
C.living
D.live


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3.單項選擇題Several languages are likely to die()

A.out
B.down
C.off
D.of

4.單項選擇題Heat causes the()of gas.

A.growth
B.increase
C.expansion
D.extension

5.單項選擇題He is() at doing this kind of job.

A.imefficient
B.nonefficient
C.unefficient
D.inefficient