A:城市街道洒水降尘
B:发展水力、风力发电
C:露天焚烧秸秆、树叶
D:乘坐公交车或地铁出行
— Because nobody ____ (hand) in their homework.
如图是心脏解剖图,请据图回答:
If you don't know the meaning of the word, try to ______ it.