Turn the following sentences from ACTIVE into PASSIVE:

1.       The students of chemistry made many experiments last week.

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2.       When will you do the work?

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3.       My brother has sent me this interesting book.

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4.       He couldn’t find his key.

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5.       For the past years, I have done all my washing by hand.

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6.       The police haven’t found the murderer yet.

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