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.
At the foot of the mountain ________, which caught my eye.
Everyone was silent as the organizer ________ the result of the speech competition.
After a few courses on painting, Helen said she would ________ oil painting in her spare time.
Most people are familiar with the idea that all matter in the universe ________ atoms.
________, Nathan gave back the enormous amount of money he found.