[ Passive Voice with Modals ]
Food waste ______ composted to create fertilizer.
A. must be
B. can be
C. may be
D. should be
Select your answer:
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Adverbs of Frequency › View(70%) I _____ read in bed at night.
A. never
B. always
C. frequently
D. sometimes
Grammar › View
We _____ for about 20 minutes when the plane was hit by turbulence.
A. flew
B. were flying
C. had flown
D. had been flying