To Chinese students who are learning English, more attention must_______ grammar.
Mr. Brown is 70 this year. Although he is very old, ____ he works very hard.
–How often do you wash your hair?
Jim often goes to school _____ bike. But today he goes to school _____ the school bus.
I have _____ American friend. He is _______active boy.
Lily is _______ English girl. ________ is a student. A. a, He B. an, She C. an, He