______ is a chemical reaction between substances, which usually includes ...

[ Vocabulary ]

______ is a chemical reaction between substances, which usually includes oxygen and produces heat and light.

A. Combust

B. Combustion

C. Combustible

D. Combusted

Select your answer:

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Of little value or importance.

A. loped

B. meager

C. trivial

D. beholder

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You …….. cook more; there’s enough food.

A. have to

B. mustn’t

C. must

D. don’t have to