[ Grammar ]
The city produces 20 million tons of household _______ each year.
A. pollution
B. waste
C. globalization
D. activity

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Modals › ViewYou ___ call your parents to let them know you arrived safely.
A. should
B. must
C. would
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The population of the earth ____________ dramatically over the years, and this is causing many problems for our planet.
A. is growing
B. grew
C. has grew
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A. to study
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Where does the nearest gas station?
A. True
B. False
