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.
______ late in the morning, Bob turned off the alarm.
He gained his ______ by printing ______ of famous writers.
We worried about ______ he was in good health.
I ______ the novel by the time you ______ back next week.
The number of the audience, ______ we had expected, was a thousand.