It’s _____ ruler.It’s _____ red. A. a ; 不填 B. 不填 ;不填 C. 不填;a
—Can I use your bike for an hour? —.
—Why not John a toy car for his birthday ? —Good idea! He is crazy about cars.
Paul took exercise after school. He needed a good rest.
I by what you have told me.
—Do you know sound travels very fast ? —Yes. But light travels sound.