1 . A dozen parks ___ in recent years, ________ as both tourism destinations and natural oxygen bars.

A．was built; to serve	B．have been built; serving
C．built; serving	D．have built; served

2 . 此外，我们特别感谢您放弃了整个春节假期，志愿为社会服务。（用物化主语汉译英）

3 . 作为一名党员，他觉得他的职责就是全心全意为人民服务。
As a party member, he feels his duty is ________ heart and soul.