题目内容
将下面句子变为被动语态，每空一词。
They produce silk in Suzhou．
Silk ________ ________ in Suzhou．
The children will sing an English song．
An English song ________ ________ ________ by the children．
I have given this book to the library．
This book ________ ________ ________ to the library．
Did they build a bridge here a year ago?
________ a bridge ________ here by them a year ago?
We'll put on an English play in our school．
An English play ________ ________ ________ on in our school．
