五.语法填空 (20分)
Enough sleep is important to health. The amount of sleep needed 1       (depend) on the age of the person and the conditions in 2      sleep takes place. The young may need more sleep than the old, but usually eight hours are enough for the health of grown-ups. Some can do with 3     than this amount, but 4       may need more. Every person knows his own need. 5       is then a matter of good judgment to satisfy his need. Sleep6      always be enough to make one bring back his 7       (strong) and get ready for a day’s work.
    Fresh air is necessary to sound sleep. So it is not without reason for some people to think that it is practicable to sleep in the open air. A bath at bedtime,  8      hot nor cool but of body temperature, may be   9__ (help) to sleep. Sleep producing drug(帮助睡眠的药物) should never be taken except when 10      (suggest) by a doctor.