There are more than 200________ stars in our galaxy
A. billions B. billions of C. billion
He is an ___________ boy from a small village in Guangxi.
A. eight—year—old B. eight—years—old C. eight year old
You have heard of him, ___________?
A. don’t you B. didn’t you C. haven’t you
She ___________ to Shanghai on business.
A. have been B. has gone C. has been
Have you __________ entered a composition?
A. everB. already C. never