仿照例子，選擇合適的單詞或詞組，把它們的字母編號寫在相應(yīng)句子旁邊的橫線上。

Example：
Children learn and have lessons here.A
（1）The lowest part of something.

E

E

（2）It means someone has bad manners.

B

B

（3）A place for planes to land and take off.

F

F

（4）A person who invents something new.

G

G

（5）It's the land that is covered with trees and plants.

C

C

（6）You feel unhappy because bad things happened.

H

H

（7）Make water，air，or land dirty.

D

D