Change into active voice

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Exercise 11: Change into active voice. (1)
1. This book is bought by my mother.
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2. The export division is managed by Mr. Sam.
3. English is spoken by them.
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4. The bike is ridden by Nina every evening.
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5. Information technology is studied every day.
6. An English book is bought by my best friend.
7. The dog is sold by Sam.
8. My room is decorated by me.
9. The car is washed by John and his uncle.
10. The house is cleaned by my mother and me.
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