[ Modal Verbs ]
We ……… walk on the grass. It’s forbidden.
A. must
B. mustn’t
C. have

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Grammar › ViewBella usually _____________ her homework carefully.
A. do
B. does
C. did
D. doing
Grammar › View
If you finish your homework early, you ______ study tonight.
A. must
B. mustn’t
C. have to
D. don’t have to