---So you were in the supermarket __________ you heard a strange sound, right?---That’s true. I ran out as quickly as possible.
We’d better turn off the tap when ________________. A.brush teeth B.to brush teeth C.brushing teeth
-How do you learn English words? -__________making flashcards.
I used to_________up very late,but now I’m getting used to_____up early.
Last month a new law(法律)_________in China to stop people from smoking in public places.
He was seen____________ the garden just now.