To know what is good and _______ are two different things.

Many scientists ____their own eyes and ears than the theories of the ancients.

Although he did not feel well, he insisted _________ going there together with us.

The conference _________ in Beijing next week is bound to be a great success.

My brother brought me a few reference books, but _________ of them was of any use for my report.

Hardly had I got home ___the telephone rang.

So clear was his _________ of the case that others had no more to say.

___________ that Bob had got promoted，his friends came to congratulate him.

By the end of this year Mr. Smith ______ in our company for exactly three years.

l didn＇t answer the phone ______ I didn＇t hear it ring.

When I first arrived in Japan, I was surprised ______the way people greeted each other.