Ancient Greeks were responsible for many of the _______ in science and other fields．

What’s the _____ of having a public open space where you can’t eat, drink or even simply hang out for a while? 

We have moved into a four-room flat so far. Our room is between _____.

The difficulties they are facing are just beyond          though they are determined to continue their research.

You’ve just missed your ______, and you will have to wait for the next round.