Nowadays, more and more people choose to drink alcohol to escape the _____ caused by heavy work. 

Most air pollution is caused by the burning of ____ like coal, gas and oil. 

We forgave his bad temper because we knew that his son's illness had put him under great _____.

Though having lived abroad for years, many Chinese still       the traditional customs.

At the meeting they discussed three different ______ to the study of maths.