It is reported that the scientists in our county are______all possible ways to control H1N1 flu.

nned to climb the mountain today, but in such ______ bad weather, it seems out of ______ question.

A team of Americanscientists has found a treatment to protect humans from the deadly H5N1 fluvirus, ________ brings great ________ to the world.

The book which is of being read a second time is 15dollars．

Just as the clothes a person wears, the food he eats and the friends with whom he spends his time, his house ______ his personality.