一、选择：
1. His brother would like to be ____UNICEF worker, for ____organization has been his dream workplace.
A. a, the B. an , the C. the, the D. /, an
2. I think ________necessary to do some running in the morning.
A it B that C this D one
3. We should prevent air pollution ____a happier life.
A from living B for living C to live D living
4. Mum was the busiest in my family. She ______early every day.
