[ FOR & SINCE ]
I have been waiting _______ 4 o’clock.
A. since
B. for

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Grammar & Vocabulary › ViewA robot can help people ________ the cooking, cleaning and washing.
A. to
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You couldn’t help me carry these things, _________ you?
A. would
B. could
C. couldn’t
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A. write
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Grammar and Vocabulary › View
Sam and Kevin are running ________ the park.
A. on
B. in
C. under
