[ Grammar ]
They …. know if the floor is slippery.
A. is
B. am
C. are
D. were
Select your answer:
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Noun and Pronoun › ViewMy book is so expensive, ….. need much money
A. their
B. our
C. its
D. your
Grammar : Must (Necessity) › View
There are lots of things on the menu. You ___ order just a hamburger.
A. must
B. mustn’t
C. don’t have to