第二部分：英语基础知识应用（本节共60小题，每小题1分，共60分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并标在试卷的相应位置。
21. With the ______ of society, Chinese people are living a happier and healthier life.
A. movement B. development C. government D. pavement
22. A difficult problem __________ the scientist and he dad spent several days trying to solve it.
A. puzzled B. struggled C. terrified D. cheered
