_____ playing dumb with teachers. They know very well their students.
The man is weak in health, and is advised by the doctor ________more exercise.
The Yongle Bell(永乐大钟) in the Great Bell Temple is ________a man.
—Hi, Lydia. Are you going to the concert on Friday? —I’d like to. But there are so many problems_______.
We don’t doubt _______ we will complete all the projects before the year 2010.
Victor apologized for ________ to inform me of the change in the plan.