I’ll take part in the boys’ ______ race this Friday.A. 800 meters B. 800-meters C. 800-meter
She heard him the piano when she walked past his room.
I remember________you sometime at the school gate last week.You are Mr.Chen.
That’s an important event________American history.
She________TV at home when it began to rain.
—What is she doing over there? —She is waiting for her kid________home for dinner.