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A lot of is dumped into this river.
Chemicals cause .
is environmentally friendly.
Manyare in danger of dying out. Forest fires cause many animals to lose their .
How can I avoid breathing from cars while cycling in the city?
___is very harmful to the environment.
2. When I got to the cinema, the film had started.
3. The students entered the classroom five minutes after the bell had rung.
4. After she had locked and bolted all the doors, she went to bed.
5. The students did the exercise very well after the teacher had shown them how to.
6. The little boy told a lie five minutes after he had promised to tell the truth.
7. When the plane landed, the sun had set.
8. She felt sick after she had eaten a whole box of chocolates.
9. After the doctor had examined the child he had a talk with the mother.
10. When I called on my friend, he had gone out.
11. Mary had finished her homework when her father came home from his office.
12. I threw away the newspaper after I had read it.
13. After she had spent all her money she asked her father to help her.
14. The teacher gave back the exercise-books after he had corrected them.
15. The sun had risen when the farmer started work.