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.
--- I let my secretary call you several times. Do you know that? ---- I _______ in a meeting. I’m sorry.
He finally refused to ________ his plan of travelling the world.
I hope that ________ that I’ve been able to do is of some use to you.
We all admired her ______ the way she saved the children from the fire.
We should not ________ economic growth that will harm the environment.