Her natural good sense was improved by the ______ [peruse] of the best books.

A. help to find
B. help to bring
C. help to increase
D. help to get

A. Those who spend more money on others can get much more bonus.
B. People usually think spending money on themselves will make them happier.
C. Very small changes in spending your money may be enough to gain happiness.
D. Researchers think that how people spend their money is at least as important as how much money they earn.

A. an employee in a company
B. a psychologist at a university
C. a reporter in a journal
D. a volunteer in the experiment

A. the volunteers not given $5 or $20 spent their own money on themselves
B. those who spent the money on someone or something else felt happier about it
C. the volunteers were given $5 or $20 as a reward for the experiment
D. half of the volunteers could spend the money as they liked