1.  I think the most helpful invention is the light bulb. (对画线部分提问)
     ______ do you think______the most helpful invention?
2.  I'd like to have a radio. (改为一般疑问句)
     ______you______ to have a radio?
3.  He wants to have a computer because he likes playing games.(对画线部分提问)
     ______ ______he______ to have a computer?
4.  We must repair the computer now. (改为被动语态)
     The computer______ ______ ______now.
5.  I often hear her sing in the next room. (改为被动语态)
     She______ often______ ______sing in the next room.