Fill in the blanks with the words or phrases given below. Change the form if necessary.

[evaluate; expand; reveal; fertile; convince; impulse; reach; transfer; concrete; productive; take up; right away; fall asleep; back and forth; take advantage of; try to]

5. As life expectancy increases, more Americans will spend more years as retired, elderly people. Schools, therefore, have a new duty: to educate for _ _ _ _ _ _  use of free time.