I bought a dress for only 10 dollars in a sale; it was a real______.

—Yangyang carried off the first winter Olympic _____ medal for China.—Great! What ____ she won for our motherland!

The research showed beyond        that smoking contributes to heart disease．

-----Hello, Jessica! What happened?----- I could not hear you clearly because my mobile phone could not receive a good ________.

(2014·山东省十二校高三联考)Much to our surprise，the witness’s________of the traffic accident differed from the official version in several aspects.