In the United States today, in about _____ of two-parent families, both parents work outside the home

Many researchers searching for the cause of chronic fatigue syndrome believe that it can be brought on by a combination of viral infection, psychological stress, and _____.

Fill in the blank(s) with the appropriate word(s).

A report on the TV news made reference to the drug used at "raves" or all-night underground parties. What is the likely drug involved?

a) ecstasy b) cocaine c) heroin d) marijuana