Ответ:

1 Glass is very fragile.

2 We have burnt the old leaves in the garden.

3 Heat has a bad influence on people.

4 Teachers' influence on their pupils is great.

5 Have you ever been to a greenhouse?

6 Have you ever heard anything about the greenhouse effect?

7 What does this factory produce?

8 North Africa has got more than four thousand hours of sunlight every year.

9 It's rather cool on the coast, isn't it?

10 What influence have  climatic changes on people?

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