20．The young engineer won anaward（獎） for his invention on May Day．

分析 這個年輕的工程師在五一勞動節(jié)那天因為他的發(fā)明而獲獎．

解答 award   award是一個可數(shù)名詞，意為"獎品；獎項"，不定冠詞an后面加名詞，故填award． win an award：獲獎

點評 考查名詞詞義．在理解單詞詞義的基礎(chǔ)上，應(yīng)注意其數(shù)的變化．

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