Tom has ________ that he lives a happy life.

Which of those ties do you like best -_______ They are all too expensive and don’t gowell with my new suit.

The lazy boy is indeed unusual: he knows nothing, ______ does he seek to know.

restaurant on Baker Street,_______used to be poorly run,is now a successful business.

It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.