题目内容
根据汉语提示填出正确的单词形式。(一空一词)
1.The river has been _______ (污染) by waste from local factories.
2.It is a pity that the industrial cities built in the 19th century do not________(吸引) visitors.
3.Improving the city’s public transportation system is one of the _______ (挑战) Ms. Garvey now faces.
4.He ________ (折叠) the map up and put it in his pocket.
5.We hired a local ______ (向导) to get us across the mountains.
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