He devoted himself entirely to his research into viruses and it earned him a good _________in his field.

It even leaves the scientists in _______what they should call the newly born creature, which looks half-human and half-animal.

There might be life on other planets, but so far scientists haven't found enough ________ to prove it.

---If you like,I can give you a ride home.
---That’s a very kind _____ .

The medicine bought at a high price turned out to have no _____. 

Drug taking and gambling affect all_________of family life.We should stay away from them since young.

The new technology has opened up a very wide _______ of possibilities.

He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.

Do you know the        of the saying I just quoted?

We have every reason to believe that our business has shown a(n) ____ to improve.