第二节 语法填空（共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为3l-40的相应位置上。
How often one hears children wishing they were grown-ups, and old people wishing young again. Each age has 31 pleasures and pains, and the happiest person is the one who enjoys what each age gives him without wasting his time in 32 （use）regrets.
