1 Keys are used for opening the door.
2 This book is written by Lu Xun.
3 My bike was stolen last night.
4 Knives are used for cutting.
5 Who invented the light bulb?(这个如何被动语态?)Who has got the light bulb invented?
6 Thousands of trees are planted.
7 This microwave oven is used for heating food.
8 Light is invented by Edison.
9 A new library has been built in our school.
10 Cotton is planted in China.