题目内容

There are eight _____ in our solar system.

A. stars
B. planets
C. earths
D. moons

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If _____ is burnt, it will give off poisonous gases.

A. plastic
B. paper
C. wood
D. cotton

Don’t leave the _____ running after use.

A. gas
B. fire
C. window
D. tap

The oceans on earth will _____ in one billion years.

A. evaporate
B. rise
C. raise
D. flow

Human beings have so much _____ and inefficient consumption of natural resources.

A. sufficient
B. efficient
C. wasteful
D. useful

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