Topics: Modal Verbs
It’s dangerous outside these days. We _______ wear masks and gloves.
A. could
B. have to
C. may
D. can’t
Select your answer:

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Prepositions › ViewWe benefit greatly ________ the medicines and other products that biodiversity provides.
A. from
B. without
C. for
D. at
Vocabulary › View
to continue at the same level for a long period of time
A. alter
B. sustain
C. scholarship
