Change the active into the passive

EXERCISE 9: Change the active into the passive.

13.He hides the broken cup in the drawer.

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14.They keep this room tidy all the time.

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15.They all voted the party  a great success.

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16.We gave Ann some bananas and some flowers.

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17.They moved the fridge into the living room.

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18.She bought some cups of tea to the visitors in the next room.

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19.They find the new project worthless.

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20.Who wrote the poem?