[ Modals of Obligation and Permission ]
You ——- use a helmet is for your safety
A. must
B. don´t have to
C. need
D. have to

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Contractions and Conjunctions › View__________ foot did I just step on?
A. Who’s
B. Whose
Grammar and Vocabulary › View
It’s getting … outside. Let’s go home.
A. better
B. on my nerves
C. dark
D. into trouble