We are confident that the environment________by our further efforts to reduce pollution.                                                                (2013·辽宁，30)

Give me an undisturbed hour and I’ll see the work Tom ___ unfinished.

Scientific surveys conducted during the climbs ______that Mount Huandoy in Peru______ 6395 meters high

 —I wonder what makes you a successful manager.—I ________ as a waiter for five years，which contributes a lot to my today’s work.

The last thirty years _________ the quick development in almost every field in China.