David’s father is a doctor Beijing International Hospital.A. in B. at C. on
-Do you know _______ World Water Day is?-On March 22nd.
Mr Wang has worked as _______ English teacher for more than 10 years.
-Have you ever seen the film "The Founding of A Republic"?-______ . However, I hear there are many stars in it.
-______ join Music Club?-I’m sorry. I can’t sing or dance.
Kevin found ______ last week. He was very happy.