[ Modals and Responsibilities ]
You ___ pay attention in class.
A. must
B. ought to
C. need to
D. responsible for

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Grammar › ViewIs there a plate?
A. Yes, there is.
B. Yes, there are.
C. No, there isn’t.
D. No, there aren’t.
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___ hour ago we met ___ history teacher.
A. A / an
B. A / a
C. An / a
D. An / an