[ Definite and Indefinite Article ]
______ Lake Baikal is the worldoldest and deepest lake.
A. the
B. a
C. an
D. no article

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Modals and Responsibilities › ViewYou ___ take breaks while studying.
A. must
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What _____ at 11.30 pm yesterday?
A. were you doing
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I ________ tennis at the weekend.
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