Yesterday, I met my old friend ________, which gave me a big surprise.
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.
---- Really? Who will give _________ lecture? ---- Mr. Wang, ________ professor from Nanjing University.
The weather in this area is generally warm,but it be very cold sometimes.
Not everyone is equal to the task because it special skills and much patience.
The experiment turned out to be very successful, was more than we could expect.