I have a lot of books, half of ______ novels.

Smoking, _______ is a bad habit, is, however, popular. 

. On the train to Tibet, I met Paul, ______ I thought was a typical Englishman.

--- The patient looks much better. _____is it that has made him _____he is today?--- Perhaps the special medicine and his family’s patient care.   

        that they may eventually reduce the amount of labor needed on construction sites by 90 percent．