Any substance that cannot be decomposed into simpler substances by ...

[ Vocabulary ]

Any substance that cannot be decomposed into simpler substances by ordinary chemical processes

A. atom

B. element

C. compound

D. molecule

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Past Tense › View

While I …… the homework, my sister …… the dishes.

A. did – washed

B. was doing – washed

C. was doing – was washing

D. did – was washing

Grammar › View

I finished my essay yesterday but …….. it in to the tutor yet.

A. I’ve given

B. I haven’t given

C. I didn’t give

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