— Xu Beihong is known _____ a great Chinese painter.— Yeah. He is famous _____ his horse paintings.
— What are you going to do this weekend? — I’m not sure ______. Maybe I am going swimming.
— Why are you so happy, Henry? — My old friend David is coming to visit me. We haven’t seen each other ______ five years.
— Can I help you, boy? — Yes. There is ______ wrong with my bike.
— Mary, is that umbrella ______? — No. It belongs to Jane.
— ______ are you going to Guangzhou? — I’m taking the plane.