当别人问你“What’s the dog doing?”，你应该回答：_____。
A. He’s play football.
B. He’s playing football.
C. He playing football
( ) These are _____.
A. bike B. bikes C. a bike
（） — How do you go to school?
—I _____ school.
A. walks to B. walk C. walk to
（）— _____ does your brother go to school?
— By bike.
A. Where B. How C. What
（） — _____ do you work?
—I work at a school.
A. What B. Where C. Why
（）My father is a _____.
A. worker B. work C. works