4. Put a suitable word in each blank to complete the passage. (2.0 pts) 
    As you know, there are many causes of pollution. There (1) _____________ also many ways to prevent pollution. We need to keep on thinking of ways to (2) ___ pollution. Some (3) _____________ to prevent pollution are to try to persuade families to only have one car. They would save some (4) _____________ and it would save our planet. If you are really good at persuading, you might want to talk to a car dealer and tell him to tell families to only have (5) _____________ car. You could ask some truck (6) _____________ to not drive as much. They could try to put more food (7) _____________the trucks to save time. You could also make some flyers and give them to some neighbours that live near you. You could encourage more (8) ________ who live close to work to walk or ride a bike.