[ Modals and Daily Vocabulary ]
Which modal verb best fits the sentence: “You _______ eat in the classroom. It’s against the rules.”
A. must
B. should
C. must not
D. may

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Grammar › ViewThe computer _________ slowly since we installed the new operating system.
A. was running
B. has been running
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Ostriches eat _____ sand and small stones to help them digest their food.
A. a
B. an
C. the
D. x
