Change the following into passive

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Practice 1 Change the following into passive
9. Nobody will know our plans for the project.
2. Readers mustn't take these books home.
3. We can make some kinds of cake without flour or butter.
4. People can buy tickets for the show in advance.
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5. Passengers can leave their luggage in the lounge.
6. Can we remove the language barrier?
7. If they cannot fix a satellite, they will leave it floating in space forever.
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8. What should we do to help people in the flooded area?
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