—Is this your pencil ?           —No, ______ is here. I think it’s Yang Hua’s.                

Yao Ming is one of the top basketball players in the world. We all like him.

Which is _____ difficult, this one or the other two?

I hope there will be ___people and _______pollution in the future. Then our lives will be better.

– What a nice motorbike!______ have you been on it?–Just to Beijing