I don’t believe that this _____ boy can paint such a nice picture. A. five years old B. five-years-old C. five-year-old
The math problem is _____ difficult that only _____ students can work it out.
________ fathers are both doctors.
Please __________ the light when you leave the classroom.
When you go _________ the street, you must be careful.
I ______ an hour finishing my homework yesterday.