[ Modal Verbs ]
It refers to something which is necessary.
A. must
B. don’t have to
C. can’t
D. should
Select your answer:

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Grammar › ViewThe _____ in my city is getting cleaner. There are more trees and fewer cars downtown.
A. air
B. nose
C. graffiti
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The charity uses the money to help people in …….. zones.
A. threat
B. war
C. fight
D. conflict
