shèng kāi
wán shuǎ
diào yú
guān chá
____
hé lǒng
yì běn zhèng jīng
yǒu qù
yǐn rén zhù mù
下列说法正确的是（ ）
—Can you believe I paid 15 yuan for these three apples?
—You should try the supermarket________I went yesterday.Fruits there are cheap.
Fire safety at home
We must not……
We must ……
When there is a fire, we……
合成该高聚物的单体是