[ Conjunctions and Preposition ]
Ways must be found to prevent the poisonous gases on / from polluting the air.
A. on
B. from
Select your answer:

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Grammar › ViewYou _____ put salt in her food; the doctor said she can’t eat salt.
A. have to
B. don’t have to
C. must
D. mustn’t
Mixed General Quiz › View
He challenged Seymor to a ___
a. duel
b. dual
c. duet