_________ the unwritten rule goes, study is good, but health comes first.

We’ll never forget the days ______ we lived in the country.

My friend, Tom, may have missed taking the flight to Africa, ______ he can’t arrive for another hour.

She says she still remembers the things and the persons ______ I told him last year.

Last week, only two people came to look at the house, ____ wanted to buy it.