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.

We have worked for a long time, let's stop to have a short rest, _____? 

Keep silent please,_       ?  

There were many giant octopus, _______?

He hardly hurt himself in the accident, _____?

She's read the story, _____she?

Tony had a wonderful time last vacation, _________?

句型转换

—You aren't a stranger, are you?
—____, don't you remember_____me at the school gate ten minutes ago.