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2) Scientists carried out ___________________ research projects called Person Perception to see how people estimate the age of others.

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3) I believe that these three principles can ___________________________ solving some of the very toughproblems that we face in the world today.

4) In psychological studies of why people____________________charity, many donors say the mere mention of money makes them less likely to help.

5) The Internet has remarkably changed the way people do business, entertain themselves, exchangeideas, and _________________________ one another.

6) About 75 percent of those surveyed today _____________________________ being less sympathetic thanwhat was the average score 30 years ago.