综合填空：用所给单词的适当形式填空

综合填空：用所给单词的适当形式填空
always not important get little until spend with class math
A good night's sleep is [ ] for everyone .To do well in a test or do sports[ ] tripping over your feet,you need to have enough sleep. But a new report shows that over 70％ of junior middle school students do not[ ] enough time sleeping.
Zhou Xiaolin, a Junior 2 student in Beijing, is one of those teens.She [ ] up at six in the morning to b e at school by seven .Then it is time for [ ]. After school,she does homework,math,English ,physics.She does not go to bed [ ] midnight.“ I[ ] get about six hours of sleep a night.I have [ ] time to get more .”she said.
Zhou's six hours is not unusual among teens. However,doctors say most teens need at [ ] 8.5 hours of sleep every night.