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