--Sit down,please.--_________.A.Yes B.Thank you C.Bye-Bye
How about_________out for a walk, mum?
I don’t think he tried his best to learn English, ___________?
He spends as much time as he can ___________ English every day.
I found Li Ming ________in the river on my way home.
_______ is necessary for us _______ our own dreams.