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EXERCISE 4: CHANGE INTO PASSIVE
1. How many languages do they speak in Canada ?
2. Have you finished your homework ?
3. Did Mary buy this beautiful dress?
4. Who wrote this novel?
5. Where did you buy this computer ?
6. Who invented the telephone ?
7. When did Alexander Graham Bell invent the telephone ?
8. Do you decorate the house on Christmas day?
9. Who sent you this letter ?
10. What did Peter Carl Goldmark invent in 1950 ?