We all know trees play an important role in _______up the air.
— What’s in the tree? — ______.
— _____ does Uncle Li go fishing? — Twice a month.
— Do you often chat with your friend _____ at weekends? — No, I often watch games ______.
What about _____ some dumplings for the Spring Festival?
We often take _______, and we do morning _______ every day.