The three things, as you offered, that motivates me most is environments and parents' effort.

Hello, Mr. [이름]!

Thank you once again for sending your homework.

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Jean

The book is the one of that motivates me.

>> A book is one thing that motivates me.

>> OR: I find reading books motivating.

 I have had a lot of books even until now.

>> CORRECT

>> OR: I\'ve been collecting and reading books for a long time.

 And my parents\' advice is always help me to live fairly.

>> In addition, my parents\' advice has always helped me to live fairly.

 And if I choose the third one, it\'s my greed for money. 

>> My greed for more money is probably my third motivation.

>>OR: If I were to mention the third thing that motivates me, it would be my greed for money.

 More or less, it\'s neutral position for me,it is like as the consequence of my personal thoughts.

>> I can\'t say for sure what my motivations are.

 And you become the motivation to me for the need of speaking english.

>> Further, you are now one of my motivations in improving my English communication skills. 

 You always cares me so I can study english more than ever.

>> You have always shown your care and concern for my improvement.

 Thanks for reading. Bye.

>> CORRECT