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.
