Change these sentences into passive voice

Exercise 5: Change these sentences into passive voice
1. My father waters this flower every morning.
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2. John invited Fiona to brithday party last night.
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3. Her mother is preparing the dinner in the kitchen.
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4. We should clean our teeth twice a day.
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5. Our teachers have explained the English grammar.
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6. Some drunk drivers caused the accident in this city.
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7. The manager didn't phone the secretary this morning.
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8. Did Mary buy this beautiful dress?
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9. The German did'n build this factory during the Second World War.
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10. The Greens are going to paint this house and these cars for Christmas Day.
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