[ Tenses ]
You must ____________ a helmet.
A. wear
B. wearing
C. wears
D. is wearing

Random Topics:
Present Perfect SimpleTenses and ArticlesArticles and QuantifiersThird ConditionalComparison of Adjective and AdverbCohesive DevicesPrepositionWord Form & Verb TenseConditional ClausePast and Past ContinuousOther quiz:
Grammar › ViewHe couldn’t concentrate ………………. his work, so he went for a walk.
A. on
B. in
C. about
D. at
Grammar › View
I live in ___ apartment. ___ apartment is big.
A. a, the
B. an,the
C. the, the