—How often does the programme Xiuhuliaozhai come out on YWTV? —It comes out every Saturday, it’s a ________ programme. 

-- Is air the lightest thing in the world?-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.

My brother doesn’t like skating. I don’t like it, _________. 

----May I borrow your pen, Mike ? ----Yes, of course. Here are some and you can take ______ of them. 

 ----Where is my watch? I can’t find it.----Don’t worry. It must be ______ in your room.