[ Vocabulary ]
Mirrors would then concentrate this stream within the tube into a continuous infrared __________ beam.
A. latitude
B. laser
C. mutation
D. magma
Select your answer:
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Grammar › ViewWhen I was a kid, I ____ believe that my dad wasa spy.
A. would
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You _____ touch that, it’s against the rules!
A. must
B. don’t have to
C. mustn’t
D. have to