Change the following sentences from active into passive form.
1.What should we do?
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2. How many tables have you made?
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3. What do they teach?
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4. Which can you show?
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5. Who are they talking about?
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6. How much money do you spend on shoes?
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7. Which poem did you read?
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8. What are you buying?
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9. Where do people speak Vietnamese?
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10. How did the police find the old man ?
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