I have always felt regret for giving up on music lessons at the age of 8. So I ___41___ that my children should learn to play the piano.

Practicing was ___42__ difficult to my daughter. I bribed(贿赂) and demanded, but nothing ___43__ her that practicing the piano was for her own good. On one particularly difficult day, ____44__ she became extremely angry, I told her, “You’ll thank me one day.” With tears ___45___ down her face, she replied, “Mom, I promise I will never thank you for ___46___ me play the piano.”

But when she moved away from home, she sent me the letter that every mother dreamed of. She thanked me, not for making her play the piano, ___47__ for doing her washing over the years and ___48___ thousands of dinners and teaching her how to clean a room. She wanted me to know that all that hard work had not gone___49__. When she had to do all those things on her own, she appreciated how much I had done for her. After reading the words, I was in tears.

Nothing gives me more __50__ than cooking a good meal for my children or __51__ up late into the night to help them __52__ a difficult Calculus (微积分学) class problem. But often I __53__: Do they appreciate that their mother, who hasn’t taken a Calculus class for 30 years, is still__54___ to help them work out the problem？We often live our life without noticing what others do for us and__55__ that we live in happiness.