—Mike is the __________student to come to school these days.—Yes, he is. He is the only ________American here!

  -- _____is that used for?---_____ the floor.

Confucius Constitute is a worldwide non-profit （非营利的）organization, _____ the Chinese government set up to popularize（推广）the teaching of Chinese and spread the Chinese culture.

I would appreciate ________if you could come and help me with my work. 

---Is there anything else I can do for you, Jack? --- No, thanks. I really appreciate ______ when you lent all your notes to me before the exam.