Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that best fits each of the numbered blanks from 1 to 5.

Why is it that many teenagers have the energy to play computer games until late at night but can't find the energy to get out of bed ___(1)___ for school? According to a new report, today's generation of children are in danger of getting so ___(2)___ sleep that they are putting their mental and physical health at ___(3)___. Adults can easily survive on seven to eight hours' sleep a night, ___(4)___ teenagers require nine or ten hours. According to medical experts, one in five youngsters ___(5)___ anything between two and five hours' sleep a night less than their parents did at their age.

By Tim Falla and Paul A.Davies, Solutions Advanced. OUP