—Have you ever heard of Langlang?—Sure. He is one of ______ pianists ______ I have even seen. 

--- Thomas does well in dancing. How about Bob?--- Bob is_____, I think. He once won the first prize in a dancing competition.

--- How tall the boy is! --- Yes, he is taller than __________ in his class.

There are ________ bears on the earth because they have ____________ space on it．

Day by day, I became   to everyone in my class.