[ Grammar ]
I _____ leave before 8.30 or I’ll be late for school.
A. must
B. mustn’t

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Grammar › View_________ book is really good.
A. This
B. That
C. These
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Prepositions of Time › View
Use the appropriate preposition of time in this sentence: We will be on vacation ___ two weeks.
A. for
B. in
C. at
D. during