[ Modal Auxiliary ]
………………….. I go to the bottle filling station to refill my bottle? (permission)
A. Must not
B. Must
C. May
D. Should
Select your answer:

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Modal Verbs › ViewYou ………. pay to use the library. It’s free.
A. don’t have to
B. must
C. should
D. ought to
Grammar › View
My mother carries _________ umbrella to work everyday.
A. her
B. his
C. their
D. its
