[ Grammar ]
Most advanced aircrafts now —- at supersonic speeds.
A. could have fly
B. are able to fly
C. had to fly
D. were supposed to fly

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Vocabulary, Adjective & Preposition › ViewThe thick __________ in the city made it hard to breathe and see.
A. smog
B. squall
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Which end mark should you use for the sentence below? Is there a quiz today___
A. .
B. ?
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Grammar › ViewBefore I went to bed, I (lie, lay, laid) my clothes out for the morning.
A. laid
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‘I’m doing my homework a the moment.’
He said that he ……….. at the moment.
A. Done his homework
B. has been doing his homework
C. was doing his homework
