His alarm clock didn’t this morning, so he was late for school.
Our English teacher is very popular among students because he always keeps his classes _____.
Bad luck! I tried many times but _______again this time.
—Mum, must I stay there the whole day? --No, you ______. You ______ come back after lunch, if you like.
There used to be a lot of tall buildings,_________?
---Do you know ______famous tennis player named Li Na? ---Yes. She plays tennis well.