一、单项选择（共10小题；共10分）
1. It's time for us morning exercises. Let's downstairs.
A. do; go B. to do; to go C. to do; go D. doing; go
2. David Beckham has children. Brooklyn Beckham is his son.
A. third; first B. three; one C. three; first D. third; one
3. --- Hi. Why do you make the boy at home?
