Trees help ________（净化空气）, so we should plant more trees.

The old man used to sit ________（在树阴下）in summer.

All plants ________（汲取能量）from the sun and make it into food.

The dead leaves cover the ground, so the water ________（不能把土壤冲走）.

The sun gives out light and ________（热）. All living things depend on the sun.

We should eat more beef. It can give us more ________（能量）.

I'd like two ________（千克）of fish and three bags of milk.

Sharks ________（以……为食）fish, plants from the sea, or smaller sea animals.

The boy dug a ________（洞）in the ground in order to plant a tree.

Do you know that ________（玻璃杯）is made of ________（玻璃）?