G 4 Unit 7 +

I think you ...................... right.

• is

• am

• are

• was

We shouldn't ....................... garbage.

• drop

• drops

• dropped

• dropping

Why is it important ................... plant trees?

• in

• of

• at

• to

Forests can ........................ carbon dioxide.

• absorb

• store

• give

• take

The .......................... environment has little water.

• country

• desert

• coastal

• rural

The ......................... environment is noisy and has a lot of traffic.

• urban

• rural

• coastal

• polar

There are no trees or flowers in the ........................ environment.

• rural

• urban

• coastal

• polar

Today, we're ...................... about pollution.

• talk

• talking

• talks

• talked

What ...................... doing to stop pollution?

• are we

• we are

• have we

• can we

I am ........................ to school now.

• walk

• walked

• walks

• walking