句型转换

　1. 主动语态与被动语态相互转换，每空一词（含缩写）。

　　56. We call maths the language of science. （改为被动句）

　　Maths _________ _________ the language of science.

　　57. Where did they plant trees? （改为被动句）

　　Where _________ trees _________?

　　58. You can borrow two books at a time.（改为被动句）

　　Two books _________ _________ _________ at a time.

　　59.The teacher made the students copy the text.改为被动句

　　The students _________ _________ _________ copy the text.

　　60. They produce silk in Suzhou.（改为被动句）

　　Silk _________ _________ in Suzhou.

　　61. They built a bridge between the two islands last year. （改为被动句）

　　A bridge ________ ________ between the two islands last year.

　　62. A birthday party will be given tomorrow. （改为主动句）

　　We _________ _________ a birthday party tomorrow.