A sense of __________ is the basic requirement for people working in the service industry,     such as education and health care.

Many firms give away small quantities of their productions as _______ so that people can try them before buying.

Never judge a man by his _____ alone — you might be fooled by what he looks like. 

Nowadays, a growing group of dieters are trying extreme calorie _____ for a long life by eating less food. 

 I am surprised that you should have been fooled by such a simple ______.