题目

It was Mother’s Day , the day we celebrate everything mothers are and everything we do .But that Sunday in 2008 was bittersweet for me . As a single mother I tended to think of my shortcomings —how many evenings I couldn’t spend with my children , and how many things I couldn’t    21    my waitress’ salary to buy . But what    22   kids I had! They were   23    impolite enough to complain. As I walked into the kitchen quietly to start breakfast, I was greeted by a vase   24    a dozen red roses ! But even their delicate beauty was overshadowed by the note sitting测量长度的基本工具是    ，在国际单位制中，长度的主单位是    ，他的符号是    ．