See what you have done !Don’t have you a ____ of right and wrong ?

When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.

I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.

Nobody knows the man killed in the accident, so it is difficult for the police to find out his _____.

“May I take your order now?” “We’d like three black _________ and two green _________.”