All the students agreed to go to Qingdao by ______ sea and camp by ______ sea.
— 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.