未知题型 If you ask why I plan to study in the United States， the only answer is that it is a _______ for me . A.chapter B.ceremony C.chamber D challenge

未知题型 You have greatly _______us. What you have done is not what you told us about several weeks ago. A.disappointed B.deserted C.clarified D.opposed

未知题型 His temper and personality show that he can become a soldier of the top ___.A) circle B) rank C) category D)grade