____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
________makes the book so extraordinary is the creative imagination of the writer. (2013·北京,31)
________ you said at the meeting describes a bright future for the company.(2013·四川,6)
Whenever I met her,________ was fairly often,she greeted me with a sweet smile.
They live in a small house,and in front of ________ stands an orange tree.
The road conditions there turned out to be very good,________ was more than we could expect.