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把下列各句改为被动语态 1. We clean our classroom every day.

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把下列各句改为被动语态
1. We clean our classroom every day.
    Our classroom ________ ________ every day.
2. They produce silk in Suzhou.
    Silk ________ ________ in Suzhou.
3. They speak English in class.
    English ________ ________ ________ ________ in class.
4. He teaches us ten words every class.
    Ten words ________ ________ to us ________ ________ every class.
5. We use keys for opening the door.
    Keys ________ ________ ________ opening the door.
1.is cleaned  2.is produced  3.is spoken by them  4.are taught by him  5.are used for