选词填空:从方框中选择正确的单词并填空。
1.They provide both shelter and food ________ animals and insects.
2.People ________ Shanghai speak English well.
3.Oil and coal come ________ the plants and animals that died millions of years ago.
4.Birds ________ their nests in trees.
5.We must stop ________ down the forests.
6.People in poor countries burn wood ________ fuel.