[ Modals of Obligation ]
Visitors _______ register in advance for the guided tour of the museum. However, they are free to come and visit without a guide anytime.
A. must
B. mustn’t
C. can
D. can’t
Select your answer:
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Gerund and Infinitives › ViewMy sister spends hours on the phone _____ her friends
A. to text
B. text
C. texting
Modal Verbs and Permission › View
Which modal is the most formal when asking for permission?
A. Can
B. Could
C. May
D. Can’t