Do you know the _____ between these two words?
--Do you still remember the days ________ we spent in the country?--Yes, of course, they were peaceful and relaxing.
There is no dictionary _______you can find everything.
He is one of the cleverest students ________ hard work was paid in the end.
The first thing ______ we should do is to tell him the news.
Great Britain is one of the countries ____ people drive on the left.