主動(dòng)語(yǔ)態(tài)與被動(dòng)語(yǔ)態(tài)相互轉換，每空一詞（含縮寫(xiě)）。

　　1. We call maths the language of science. （改為被動(dòng)句）

　　Maths _________ _________ the language of science.

　　2. Where did they plant trees? （改為被動(dòng)句）

　　Where _________ trees _________?

　　3. You can borrow two books at a time.（改為被動(dòng)句）

　　Two books _________ _________ _________ at a time.

　　4.The teacher made the students copy the text.改為被動(dòng)句

　　The students _________ _________ _________ copy the text.

　　5. They produce silk in Suzhou.（改為被動(dòng)句）

　　Silk _________ _________ in Suzhou.

　　6. They built a bridge between the two islands last year. （改為被動(dòng)句）

　　A bridge ________ ________ between the two islands last year.

　　7. A birthday party will be given tomorrow. （改為主動(dòng)句）

　　We _________ _________ a birthday party tomorrow.

　　8. John was seen to cross the street just now by someone.（改為主動(dòng)句）

　　Someone _________ John _________ the street just now.

　　9. Can another way be thought of to keep your wine or water warm?（改為主動(dòng)句）

　　Can _______ _______ _______ another way to keep your wine or water warm?

　　10. Too many trees are still being cut down in the USA. （改為主動(dòng)句）

　　_________ are still _________ down too many trees in the USA.

　　答案：
　　1. is called 2. were,planted 3. can be borrowed 4. were made to

　　5. is produced 6. was built 7. will give 8. saw,cross 9. you think of

　　10. People/They,cutting