Lawrence Craven, a doctor from the US, introduced the idea in 1953 _______ aspirin has the potential to reduce the risk of heart attacks.
Your brothe__________be hungry now.-----he had lunch only two hours ago!
AIDS is said__________the biggest health to people in that area over the past few years.
With a lot of problems ________, the newly – elected headmaster is having a hard time.
Soon after getting off his horse, the man appeared at the second storey windows, ___________he could see nothing but trees.
Tom was very angry about ________ to Mary’s birthday party.