根据内容提示完成句子。

1. It was also a treasure ______ ______ gold and jewels, which took the country's best artists about ten

    years to make.

2. Although he had ______ _______ _______for the final of the race he decided at first not to take part.

3. We are determined to create ________ ________ ________ system.

4. You should _______ ________ _______ _______the rainforest where I live and appreciate how the

    animals live together.

5. _______ _______ _______ ______ that Kip Keino became the only Kenyan sportsman ever to

   appear on the cover of the world famous sports magazine Sports Illustrated.

设z=f(x，y)在点(1，1)可微，f(1，1)=1，. 令g(x)=f(x，f(x，x))，则

（）。