Đáp án:
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#blackwolf4869
`4P` + $5O_{2}$ → $2P_{2}$$O_{5}$
`F + S` → `FeS`
$2H_{2}$ + $O_{2}$ → $2H_{2}O$
Choose the best answer.
We are looking for ____ place to spend ____ night.
Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.