题目

Alone in the wheel of light at the dining room table, surrounded by an otherwise darkened house, I sat in tears． Finally, I'd   1   in getting both kids to bed．A relatively new single   2   , I had to be both Mommy and Daddy to my two little children． A   3   divorced man with full custody （管理） of his children, I was   4   to give them as normal and stable a home life as possible．I   5   a happy face for them． I had risen slowly, gingerly （活跃）, trying to   6   making even the least sound which might start them up again．  7   more songs and15．细菌和真菌常常被称为生态系统中的分解者．