一、听录音,给下列图片排序。

( ) ( ) ( ) ( )

3
; 1
; 4
; 2

二、根据句意及汉语提示完成句子。
1. Rubbish ______（使……变得）the streets dirty.
2. Our classroom is ______（整洁的）.
3. Helen usually ______（乘）the bus to school.
4. Let's ______（保持）the air clean.
5. The clothes are ______（脏的）.

makes
; clean
; takes
; keep
; dirty

三、用所给单词的适当形式填空。
1. Look at these ____________(picture) of my family.
2. There are many ____________(factory) in our city.
3. Bobby often ____________(walk) to school.
4. What can we do ____________(keep) our city clean?
5. We can plant more ____________(tree).
6. The river is dirty. The fish in it ____________(be) dead.

pictures
; factories
; walks
; to keep
; trees
; are

( ) 1. Let's go to work ______ metro.
A. take
B. in
C. by

C

( ) 2. To keep the air clean, we can ______ more trees.
A. plants
B. planted
C. plant

C

( ) 3. What ______ our air dirty?
A. make
B. makes
C. making

B

（ ）4. Helen _______ to school yesterday.
A. walk
B. walks
C. walked

C

( ) 5. My father can ______ the basketball on his head.
A. put
B. play
C. puts

A