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主动语态与被动语态相互转换，每空一词(含缩写)。 1. We call maths the language of science. (改为被动句) Maths _________ _________ the language of science. 2. Where did they plant trees? (改为被动句) Where _________ trees _________? 3. You can borrow two books at a time.(改为被动句) Two books _________ _________ _________ at a time. 4.The teacher made the students copy the text.改为被动句 The students _________ _________ _________ copy the text. 5. They produce silk in Suzhou.(改为被动句) Silk _________ _________ in Suzhou. 6. They built a bridge between the two islands last year. (改为被动句) A bridge ________ ________ between the two islands last year. 7. A birthday party will be given tomorrow. (改为主动句) We _________ _________ a birthday party tomorrow. 8. John was seen to cross the street just now by someone.(改为主动句) Someone _________ John _________ the street just now. 9. Can another way be thought of to keep your wine or water warm?(改为主动句) Can _______ _______ _______ another way to keep your wine or water warm? | 
