[ Vocabulary ]
This means clean water and disposal of waste.
A. navigation
B. urbanization
C. sanitation
D. invention

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Vocabulary › ViewWhat word describes something that is “changing frequently”?
A. Enterprise
B. Essential
C. Fluctuating
D. Function
Present and Past Tenses › View
It started to snow while we … to school.
A. had walked
B. have walked
C. have been walking
D. were walking
Habitual and Continuous Tenses › ViewI’m tired. I … all night.
A. sleep
B. sleeping
C. am going to sleep
D. am sleeping
Some vs. Any › View
Could you give me … paper? (A request – I expect you will say ‘yes’.)
a. some
b. any