1. D wanted
2. C again
3. D had cleaned
4. B could
5. C saving
6. D were
7. A sense of direction 
8. A health
9. A yes, it's a good idea
10. C careful ------- carefully 
11. C have ------ has
12. A he used to play the piano at night
13. A he asked me to follow his advice
14. C the book which I bought last week is very good
15. A I'm very glad to pass the driving test
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