I. /s/ : race, recycle, center, bus, advice, sight, slow, concert, price, works

   /z/ : rose, music, because, zoo, reason, amaze, cousin, prize, caves, has

II.

1. anthem

2. composed

3. lulled

4. Rock ‘n’ roll

5. lyrical

6. solemn

7. musicians

8. integral

9. delighted

10. emotions

11. band

12. mournful

III.

1. Trees were planted along the street to reduce traffic noise.

2. I swept the broken glass off the path to prevent an accident.

3. He bought a truck to carry out his business.

4. Laura went to the bank to cash a cheque.

5. The staff are working at weekend to complete the project in time.

6. Tom turned on the radio to hear the football results.

7. Just this once Mike is going to wear a suit to look smart.

8. Jessica is borrowing some money to finance her studies.

9. We went to the market to buy some fruit.

10. I phoned to the police station to report that my car had been stolen.

IV.

1. to lose/ in order to lose

2. to protect/ so as to protect 

3. in order not to be found

4. so as not to make

5. to remember/ in order to remember

6. to reduce/ so as to reduce

7. to complete/ in order to complete

8. to take/ so as to take

9. so as not to wake up

10. in order not to be

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