从劳动角度分析，运量的增长变化主要有：一是（），二是（）。
参考答案：增加劳动力数量；提高劳动生产率
After a wonderful travel, he got down to_________ a book about it. [ ]
A. writing
B. to write
C. have written
D. write
用所给词的适当形式填空。
1. March 8th is _______ (woman) Day.
2. My brother enjoys _______ (take) a walk with his dog.
3. The bus trip is _______ (relax).
4. The good news made us _______ (feel) happy.
5. They decided _______ (see) monkeys first.
