15 Put in the correct preposition: on, in, at, or for.

1. Water boils ________ 100 degrees Celsius.

2. When I was 4, I went ________ a trip to France organized by my school.

3. I wouldn't like his job. He spends most of his time talking ________ the phone.

4. Julia's grandmother died recently ________ the age of 79.

5. Can you turn the light on, please? I don't want to sit ________ the dark.

6. We didn't go ________ holiday last year. We stayed at home.

7. I'm going to Scotland ________ a short holiday next month.

8. I won't be here next week. I'll be ________ holiday.

9. He got married ________ 17, which is rather young to get married.

10. There was an interesting programme ________ the radio this morning.

11. ________my opinion, violent films should not be shown ________ television.

12. I wouldn't like to go ________ a cruise. I think I'd get bored.

13. I mustn't eat too much. I'm supposed to be ________ a diet.

14. In Britain, children start school ________ the age of five.

15. There was panic when people realized that the building was ________ fire.

16. The Earth travels round the Sun ________ a speed of 107,000 kilometres an hour.

17. 'Did you enjoy your holiday?' 'Not every minute, but ________ the whole, yes.'

18. When you write a cheque, you have to write the amount ________ words and figures.

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