Task 4 Questions 25-32 Read the text below. For questions 25-32, choose the answer (A, B, C or D) which best completes each sentence.Mark your answer on the answer sheet. There is an example at the beginning (0). Clock change leaves teenagers more sleepy Researchers at Surrey University have studied the effects of the move to British Summer Time (0)____ teenage schoolchildren. They found that the amount they sleep decreases following the clock change and they can suffer (25) ____ sleep deprivation. They also found that (26) ____ before the change, the teenagers were getting less than the recommended hours of sleep. The need for more sleep is something teenagers are (27) ____ with. Sleep researcher Joanne Bower said: "If we don't get enough sleep, we can find problems with performance, concentration, and mood. We're lucky we are quite (28) ____ in that we generally do have an amazing ability to bounce back." The students were studied using wristwatches. These were (29) ____ constantly over a 10-day period before and after the clock change. The watches reliably indicated when the teenagers were awake and asleep. The researchers found that in the days following the clock change, the teenagers had on average less than six hours of sleep (30) ____ night. Mrs Bower said: "The body clock, which makes sure the same things happen in the body (31) ____ the same time every day, undergoes a shift during adolescence. The shift includes a delay in the production of the sleep-promoting hormone, melatonin. This (32) ____ teenagers are awake later in the evening and find it difficult to rise early in the morning. Add this to the clock change, and teenagers may suffer more than most."
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