根据括号里的要求改写句子。

1. The pen can be kept for two weeks. (对画线部分提问)

    _________ the pen _________?

2. We must send the sick man to hospital at once. (改为被动句)

   The sick man must _________ to hospital at once.

3. About one hundred stamps have been collected. (对画线部分提问) 

    ________ stamps _________ collected?

4. the boy, the glass, by, broken, was (连词成句)

    ______________________________________________________

5. The policeman saw a thief rush into a bank. (改为被动句)

    A thief ________ rush into a bank by the policeman.