The old tower must be saved, _______ the cost. 

My father was reading newspapers ____ my mother was cooking at this time yesterday evening. 

In the past few years, “My Heart Will Go On” was a popular song among young people, ____ were often heard singing it at parties.

_________ hard one may work, one cannot master a foreign language in a year or two.

The way ______ he did it was different from _______ we were used to.