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.
-Where are you exactly? I____to you from a small town about 50 miles away from your city
About an hour after sunrise,I rode across the countryside____birds were singing.
It was very dark,____Jane seemed to know which way to take at the crossroads.
Just be patient.You _____ expect the world to change so soon.
Having finished the work,__________.