Exercise 4: Complete sentences with the correct form of the word.

1. I worry about the (a)   effect that violent films may have on children. (destroy)

2. He discovered new chemical reactions and introduced improved (a)   techniques. (prepare)

3. He admitted his (a)   was inappropriate. (behave)

4. Geologists understand many of the factors that cause (a)   eruptions. (volcano)

5. With dramatic (a)   , a decision was taken to close the school for good. (abrupt)

6. This decision will have a (a)   impact on foreign policy. (disaster)

7. The planned (a)   to the motorway near London is going to cost over £4 million. (extend)

8. Breakfast is (a)   in the restaurant between 7.00 and 11.00. (serve)

9. I couldn't hear what he was saying over the (a)   of the waterfall. (thunder)

10. Don't play in the street - it's (a)   . (safe)