While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.

Do you go to the cinema to see 3D Titanic last night? — No, I _______ go to the cinema. The tickets are too expensive.

I _____ the way. I ______ here for quite many years.

My little brother can play ____ soccer and I can play ____ piano.

______is the Changjiang river in China, do you know?—Yes, it’s about 6,380 kilometers long.