Multiple-choice cloze
For questions 1-8, read the text below and decide which answer (A, B, C or D) best fits each gap.
Parents who struggle to get their teenage children out of bed in the morning may be to put it down to laziness, but researchers believe the problem has a biological . During adolescence, the body starts releasing the sleep hormone melatonin later in the evening, so many teenagers simply do not feel tired until close to midnight. they still have to be at school by half past eight, they routinely get far less sleep than they need. The effects go well tiredness in lessons. A lack of sleep has been linked to low mood, poorer memory and a higher of accidents. Some schools have experimented with later start times, and the early results are encouraging: attendance has improved and, is more, fewer students fall asleep at their desks. Critics point out that a later timetable could havoc with parents' working hours and after-school activities. Even so, the evidence is now too strong to be dismissed out of .
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