The man became a famous writer when he was ________.

—How old is Tom? —He is ____.

—What’s the time? —It’s a quarter past three.     
A. five        B. fifteen       C. fifty

16-year-old students in England should understand fifteen _______ words.

Eight and two is　　　　 .

There are ____ stars in the sky and you can see them at night.

—Jackie Chan has donated     dollars to  charity.
—He is an example to us all.

The bridge is about ___meters long.

There are about more than five ___________  "left-behind" students (留守学生) in China.

The rich man gave away 5 _____ his money to charity to help the poor children in Africa.