A. 对 B. 错
A. something very common B. something not usual
A. Mary and I are just friends who know each other B. Mary and I have very close friendship
A. are actively involved with it B. are not involved with it
A. very easy to be noticed B. very hard to be noticed
A. try hard to develop this habit B. try hard to get rid of this habit
A. express or state directly B. express or state indirectly