A lot of people travel ________ a bus.

--What do we waste ________ of all?

--Paper, I think.

I ride my hike ________ school every day.

I think more people ________ ride bikes.

I think cars and big factories ________ the most pollution.

We reuse our plastic bags, ________.

A truck ________ the cans.

People don't ________ their garbage on the ground.

Do you ________ pollution?

I think everybody should ________ the environment.