— Could you teach me how _________ cakes? — Sorry, I don’t know.
_____ he was tired , ____ he didn’t stop working .
The air in Lanzhou is getting much _____ now than a few years ago .
The teacher is speaking. Please stop _____ and listen to him.
--May I borrow this dictionary ? ---Sorry. This is not _____. It’s Lily’s .
---_____do you go to visit your grandma ? ---Twice a month