There was a _____ look on his face. He found what the expert said too difficult to understand.

Bill suggested________a meeting on what to do for the Shanghai Expo during the vacation.

The girl looked at me with a _______expression. Maybe the problem was quite ______.

Limited life should be made good use _______ our own dreams rather than be a follower or do what we are told to.

The officer gave orders that anyone________ a gun should be reported to the police station.