语法填空，.....

My high school days are over .However ,＿my memory remains the beeping of my alarm clock.its sudden bee-beep-beep in the morning always woke me from a deep sleep.After snoozing several times,I would drag＿out of bed and go to the bus stop,not quite remembering ＿I got there.
Today researchers know more about the importance of sleep than they
＿(do) many yeas ago.They think teenagers need as much sleep as younger kids,but many don't get＿because of biological and social pressures Research shows that teenagers’＿（Nature）timemay be 11pm,for＿.changes in their internal clocks.So their ideal waking time would be no earlier than 8 am, at＿point many schools are aleady having classes,though.要解释一下哦

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我高中时的日子已经一去不复返了。然而,_my记忆仍然是我的闹钟响clock.its突然在早晨醒来的时候bee-beep-beep总是把我从深睡眠几次之后,我却drag_out床,走到车站,并不完全记住_I到达那儿。 　　研究人员现在知道更多关于睡眠的重要性 　　(做)多年以前他们认为青少年需要尽可能多的睡眠,但许多年轻的孩子们不要get_because生物和社会压力的研究显示,青少年(自然)timemay 11点,for_.changes是在他们的内部时钟所以他们理想的千篇一律的时间不会早于上午8点,at_point aleady很多学校上课