把下列句子改为宾语从句
问题描述：
把下列句子改为宾语从句
1、Who are they waiting for?Do you know?
2、Does Mr Brown stay in Room 302?Could you tell me?
3、How long have the Smiths lived in Hangzhou?I want to know.
答
Do you know who they are waiting for?
Could you tell me whether Mr Brown stays in Room 302?
I wan to know how long Mr Smiths has lived in Hangzhou.