单项选择题
A．your friends is too busy to read a letter B．your friend hates to receive a letter C．your friend is not worthy of your letter D．your friend should not have written you a letter
A．some examples of shoot in US schools B．the American’s feeling C．some famous schools D．that some teachers were killed by students
A．means nothing B．concerns others C．concerns only the artist D．concerns all the people in the world