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.
A booking-office is a place _______ tickets are sold.
This is the reason _______ he was absent.
Listening to loud music at rock concerts ____ caused hearing loss in some teenagers.
______ the task is difficult, they managed to complete it on time.
That’s where I _______ live when I was a child.