Before the final examination, many students have shown ____ of tension. Some have trouble in sleeping while others have lost their appetite.

Ancient Greeks were responsible for many of the _______ in science and other fields.

He spent a large ___ of money on his books.

In China, as we all know, brides are often dressed in red as it is a________of good fortune. 

Those who suffer from headache will find they get ______ from this medicine.