Choose the option that best completes the following sentence

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Choose the option that best completes the following sentence.
Question:
10. The world's
more and more crowded.
A. pollution
B. popularity
C. population
Choose the option that best completes the following sentence.
Question:
11. NASA is now working hard to
A. discover
C. experience
Choose the option that best completes the following sentence.
Question:
12. Humans can't live unless they have enough
A. water
B. collect
is growing more quickly every year. Our planet is becoming
A outside
B. planets
Choose the option that best completes the following sentence.
Question:
whether there is life on Mars.
13. Scientists have spent years
A. collecting
Choose the option that best completes the following sentence.
Question:
14. Some scientists say that flying saucers might be people's
A. imagination
B. imagine
C. imaginative
Choose the option that best completes the following sentence.
Question:
15. When you are in orbit, you'll be out of the earth's
B. to collect
B gravity
C. food
D. pollutant
C. collected
Catmosphere
D. accept
to breathe.
information about UFOs.
D. oxygen
D. collect
D. imaginary
and you're weightless.
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