Print Froggy Jumps: Lesson 8: What Does Air Have (air - smoke

1. We start _________ when there are too many dust particles in the air.

A

crying

B

coughing

C

laughing

2. When paper or wood is burnt, black _____ is given out.

A

air

B

oxygen

C

smoke

3. _______ does not give out smoke.

A

school

B

car

C

factory

4. Smoke makes the air _______.

A

dirty

B

clean

C

better

5. Smoke is _______ to all living things.

A

useful

B

helpful

C

harmful