Didn't he see you just now? （根据句意做出肯定或否定回答）
__________, he __________. He said hello to me.
China is the greatest country in the world.（改为同义句）
China is greater than __________ __________ country in the world.
People will have robots at home in 20 years.（对划线部分提问）
__________ __________ will people have robots at home?
Though I can't watch my favorite program tonight, it's not a big deal.
__________________________________
You are supposed to ask your teacher for help.
__________________________________
It serves you right.
__________________________________
