Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.

Being blind is something ________most people can’t imagine.

When I went in , they were ____ in a heated discussion .

_______ do you want to be a newspaper reporter—I can talk to many interesting people.

The basketball isn’t _____. It belongs to _________.