1．—Difficulties always go with me!
—Cheer up! If God closes door in front of you, there be a window opened for you.
A．must B．would C．could D．can
2．The lady ________ have done something wrong, because she is looking guilty.
A．would B．should C．can D．must
3．We must ________ the act of cheating ________ a fair competition system.
A．prevent; creating B．stop; creating
C．keep; from creating D．stop; to create
4．There was a lot of fun at yesterday’s party. You _____ have come, but why didn’t you?
A．must B．shouldn’t C．needn’t D．ought to
5．The pig flu _________ through the Northern part of China for months killed a great many pigs.
A．sweeping B．swept C．to sweep D．sweeps
