[ Comparatives, Superlatives, and Modals ]
Choose the correct sentence using ‘must’ for obligation:
A. You must to wear a uniform.
B. You must wearing a uniform.
C. You must wear a uniform.

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Mixed General Quiz › ViewTo do good research it is necessary to carefully ___ the facts from many sources.
a. glean
b. green
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Traffic rules _______ by all people.
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B. must obey
C. must obeyed
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Vocabulary › ViewTo draw a conclusion from fact; to infer
A. motive
B. sleuth
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My mother ________ in the supermarket all afternoon.
A. has been working
B. has worked
C. is working
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