[ Modal Verb in Passive Voice ]
Natural resources _________________to protect our planet.
A. must not be conserved
B. must be conserve
C. must not be conserving
D. must be conserved
Select your answer:
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Conjunctions › ViewThey went home early _____ they were tired.
A. but
B. so
C. because
D. or
Grammar › View
Yesterday I _______________ to the library.
A. was going
B. went
C. going