22.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.
. You have must practiced speaking English for a long time before the contest is held, ________?
. Mary is barely a diligent girl, as it is the fourth time she has been sleeping in class, ________?
. Brian told you that there wasn’t anyone in the room at that time, ________?
. I think she always disagrees with him, ________?
. – Don’t forget to come to my birthday party tomorrow. – ________.