单项选择题
A. It is a nonprofit organization. B. It provides public health services. C. It carries out research on public health. D. It has worked in five countries till now.
A. chat with Jack socially. B. get help in the course. C. hand in their assignments. D. practice giving interviews.
A.He can’t meet his friends. B.The flight goes without him. C.He has to pay more than 795 pounds. D.He can’t stop at Hong Kong then.