按要求完成下列各句。
1. They think the computer is very useful. (改为反意疑问句)
    They think the computer is very useful, _______ _______?
2. It is impossible that a child can lift such a heavy box. (改为同义句)
    It is impossible_______ _______ _______ _______ _______ such a heavy box.
3. You shouldn't make noise while eating noodles. (改为同义句)
    You _______ _______ _______ make noise while eating noodles.
4. Henry never goes swimming in the river. (对画线部分提问)
    _______ _______ does Henry go swimming in the river?
5. Work hard, or you will not pass the exam. (改为同义句)
    _______ you don't work hard, you won't _______ the exam.