问题补充：
Enough sleep is important to health. The amount of sleep 1(need) depends on the age of the person and the conditions in _2. sleep takes place. The young may need more sleep than 3. old, but usually eight hours are enough for the health of grown-ups. Some can do with 4 than this amount, but others may need more. Every person knows his own need. 5 is then a matter of good judgment to satisfy his need. Sleep should always be enough to make one bring back his 6. (strong) and get ready for a day’s work.
Fresh air is necessary to sound sleep. So it is not 7. 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 helpful_9. sleep. Sleep-producing drug should never be taken except when _10. (suggest) by a doctor.1. needed2. which 3. the4. less5.It
答案：
(答案→)1. needed2. which 3. the4. less5.It
解析：可联系答.案.网客服索取。
