按要求完成下列各题

1. We gave away some books to the children.(变为被动句)

    Some books __________ __________ __________ to the children.

2. The girl came up with a good idea.(变为被动句)

    A good idea __________ __________ __________ __________ by the girl.

3. Bill Gates wrote The Road Ahead in 1995.(变为被动句)

   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?

6. The hand-held calculators were invented in 1991.(对画线部分提问)

    __________ __________ the hand-held calculators __________?

7. The battery-operated slippers were owented by Julie Thompson.(对画线部分提问)

    __________ were the battery-operated slippers __________ __________?