[ Modal Verb ]
You __ borrow my pen if you promise to return it.
A. can
B. must
C. should
D. could
Select your answer:

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Modal Verb › View………….. I go out?
A. May
B. Would
C. Shall
D. Will
Grammar › View
Call your parents ___ they will start to worry.
A. if only
B. otherwise
C. if so
D. in case
