— David, look at the man in white over there. Can you tell me _____ ? —He is a doctor. A. who is he B. who he is C. what he is
—Do you believe that paper is made ________ wood? —Yes, I do. And you can see that books are made ________ paper.
It seems that something is wrong with Pam. She is always trying to avoid _____my questions.
It was ______ great success that everyone was proud of it.
She used to _______with her parents, but now she is used to ______with her classmates at school.
I was so lucky that I met ______ European man on Three Gorges Square yesterday, and we had ______ happy conversation.