[ Verb Tenses ]
I __________ my keys somewhere yesterday.
A. lost
B. lose
C. losing
D. loses

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Vocabulary and Grammar › ViewAircraft flying in …….. arcs create microgravity for tests and simulations that last 20-25seconds.
A. circular
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________ the instruction, he knew how to use the fire extinguish
A. Read
B. Reading
C. Having read
D. Having readed