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1. It’s not certain that the birds are in danger of extinction.
2. It’s doubtful that we can recycle this.
3. It’s not true that we have to destroy the environment.
4. We doubt that you know the truth.
5. It’s not probable that the company will pollute the valley.
6. I don’t believe that they will discover a solution.
7. There is no doubt that we need to protect this rain forest.
8. It’s impossible for them to improve the world.
9. I deny that we are developing nuclear energy here.
10. There’s no doubt that our natural resources are in danger.
11. The animals will die unless we protect them.
12. The doctor prescribes medicine so that the dog will get better.
13. The cat observes in case the mouse comes.
14. We have to conserve nature before it disappears.
15. I’ll recycle provided that you recycle too.
15. We won’t go without your going too.
16. The mouse has to eat the cheese before the cat comes back.
17. We’re developing nuclear energy in case we need it.
18. We need a plan so that we can use solar energy.
19. They avoid pollution unless they can’t avoid it.
20. I ‘m not going to pick up tin cans unless you pick them up too.