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

 We should eat _______ fruit and vegetables, but _______ meat. It is good for our health. 

I usually do my homework _____than Mary. But she makes fewer mistakes because she is_____.

—What’ s the low-carbon life style like? . —Save       energy, produce        carbon.

--- How many English words should I remember, Mr. Black?--- ______, the better, of course.