Complete the sentences using the words and phrases given.

Whenever you can, follow / three R's / conserve natural resources.

A. It's good when forests release oxygen and absorb carbon dioxide.

B. Releasing oxygen and absorbing carbon dioxide help forests.

C. Forests contribute by releasing oxygen and absorbing carbon dioxide.

D. Without forests, we would have no oxygen and carbon dioxide.

A. Will I wait for you while cleaning up our campsite?

B. Will you wait while I am up cleaning our campsite?

C. Will I wait for you while you am cleaning up our campsite?

D. Will you cleaning wait for me while I am up our campsite?

A. The number all the time of national parks is rising over all the world.

B. The number of national parks is rising all the time all over the world.

C. The rising number of national parks is over all the time all the world.

D. The number of national parks is over the world all the time rising.

A. A fire started as soon as the boys leave the campsite.

B. A fire started as soon as the boys left the campsite.

C. A fire start as soon as the boys left the campsite.

D. A fire started as soon as the boys leaves the campsite.

A. We will save thousands of paper if we don’t waste so much.

B. We will save so much paper if we don’t waste thousands of it.

C. We will save thousands of trees if we don’t waste so much paper.

D. We save so much paper will we don’t waste thousands of it.

A. Noise pollution refers to any loud sounds that are either harmful or annoying to humans and animals.

B. Noise pollution refers to any loud sounds either harmful and annoying to humans and animals.

C. Noise pollution refers to any loud sounds that either harmful or annoying to humans and animals.

D. Noise pollution refers any loud sounds that are either harmful or annoying humans and animals.

A. Don't talk to the driver while he is driving.

B. Don't talk to the driver while he drives.

C. Don't talk to the driver while he driving.

D. Don't talk to the driver while he drive.