Change the following sentences into passive voice
1. She would like them to invite her to the party
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2. Noone helped him do his homework
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3. We ought to speak such things in public
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4. Somebody is cleaning the room at the moment
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5. Why didn't they turn on the lights?
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6. The enemy used to attack Halong Bay
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7. I could hear someone open the back window
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8. Did the tourists visit that old church last week?
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9. Betty has just sent Mary many post cards
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10. Will many people attend the lecture?
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