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.
--- Robert is indeed a wise man. --- Oh, yes. How often I have regretted _______ his advice!
Listening to loud music at rock concerts ______ caused hearing loss in some teenagers.
It is very ______ that she will ring me tonight.
---Could you turn the TV down a little bit? ---______. Is it disturbing you?
--I’m going to the States? --How long ________ you________ in the States?