I like the red skirt. The ______ is that I have no money for it. A matter B question C thing D problem
— Do you know Mozart? — Of course. He wrote _____ of beautiful pieces of music.
— I went to your house yesterday afternoon, but you were not in. — Sorry. I _______ basketball with my classmates.
—________you _____your homework yet? —Yes, I ___it ten minutes ago.
Zhang Yu is a ________ girl from Sichuan.
—_________riding our bikes to the park? —Good idea.