[ Grammar ]
If you are not in the car by the time I start ________ the engine, I will leave without you.
A. at
B. in
C. up
D. on

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a. collectively
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c. collect
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Paulo and Sam ( shop, shops ) for their Christmas gifts.
A. shop
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We should finish the project by Friday, ________?
A. should we
B. shouldn’t we
C. shall we