读句子，填空。

1. I can't find _____________ toothbrush.

    _____________ toothbrush is lost.

2. She can't find _____________ teddy bear.

    _____________ teddy bear is lost.

3. They can't find _____________ car.

    _____________ car is lost.

4. _____________ can't find your key.

    _____________ key is lost.

12个一，3个百分之一，4个千分之一组成的数是（    ）。