一篇英语短文改错

更正在括号处标明，总共十处错误，保证准确率！

Sleep is part of your daily activity cycle. But how (many改成much) you sleep and when and how deeply you sleep (is改成are) determined by many factors. Generally speaking, the (young改成younger) you are, the more you sleep and (去掉that) the more deeply you sleep. Newborn babies (sleeping改成sleep) about 16 hours each day. They sleep as much during (加入the) day as at night. During the first year of life, the (number改成amount/quantity) of sleep a baby needs decreases by two hours or (more改成so). One (recently改成recent) study showed that by six months of age, 80% of the babies are sleeping through the night and taking short naps in the daytime. By age two, children sleep about 12 hours a day, (included改成including) about 90 minutes of daytime naps. By adolescence and early adulthood, the amount of daily sleep has dropped to about 8 hours.

解释：
1. how many修饰可数名词，不能表示程度，how much可以表示程度；
2. 主语为多个从句并列，为复数概念，所以主句谓语动词必须用复数形式are；
3. 固定句型：the + 比较级..., the + 比较级...，意思是“越...，...就越...”。
所以用young的比较级younger；
4. 非从句，也就无须引导词that；
5. 单独的现在分词sleeping不能做句子谓语，sleep可以做谓语；
6. 固定短语：during the day/daytime = in the day/daytime 在白天
7. sleep为不可数名词，但是number只能修饰可数名词，所以改用amout或quantity；
8. 固定短语：or so，意思是“上下，左右”，类似于about，但是其位置放在“数词 + 名词”的后面；
9. 形容词recent做定语修饰名词study；而recently是副词，不能做定语而是做时间状语；
10. 固定短语：including + 宾语 = 宾语 + included，意思是“包括...在内”；

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delighting 改为delighted,have received 改为receive,had been 改为 am,question 前边加个a, For one reason 去掉For,you are studing 前边加个what ,is hoping 改为are hoping,For another reason 去掉For,convenience 改为convenient,as 改为when.仅供参考，谢谢。答案出来了可以告诉我正确答案么。

Dear Li Hua,
I'm pretty delighted to receive the letter you sent me two weeks ago. I have been thinking about the question you asked me. In my opinion,you should come back after you finish your study abroad. For one reason, what you are studying is badly needed nowadays in China. It will be quite easy for you to find a good job. As a matter of fact, many of big companies in our city are hoping to employ people like you. For another reason, it will be much more convenient for you to look after your parents as they are getting old. Therefore, I think it's a good idea for you to return. So what are you waiting for?
Best wishes!

一个都不会吗