句型转换。

1. We gave away some books to the children.(改为被动语态)

  Some books                              to the children.

2．The girl came up with a good idea.(改为被动语态)

  A good idea                             by the girl.

3. Bill Gates wrote The Road Ahead in 1995.(改为被动语态)

  The Road Ahead                             Bill Gates in 1995.

4．The key is used for locking the door.(对画线部分提问)

                 is the key               for?

5. This kind of machine was invented by Tom.(对画线部分提问)

                 this kind of machine invented by?