[解析]
61.leaving.考查动词形式.句中Before是介词,后面加动词的﹣ing形式做宾语,故填leaving.
62.attractions.考查名词.此处由some tourist修饰用名词,指下载了一些旅游景观,故填attractions.
63.what.考查主语从句.此处引导主语从句,指给我印象最深的地方,用what引导.故填what.
64.third.考查数词.此处有定冠词the修饰用序数词,指第三天,故填third.
65.extremely.考查副词.此处修饰动词短语be interested in用副词,指非常感兴趣,故填extremely.
66.a.考查冠词.句中acquire a good knowledge of指"获得一种很好的…知识",表示一种,故填a.
67.glasses.考查名词.此处指一副眼镜用a pair of glasses,名词用复数.故填glasses.
68.changed.考查动词形式.have sth.done"使某事被做"动词用过去分词,此处指使外貌改变,故填changed.
69.be organized.考查不定式的被动.句中in order not to后加不定式,主语they和动词recognize是被动关系,此处要用不定式的被动形式,故填be organized.
70.In.考查固定短语.in conclusion"总之",是固定短语.故填In.