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A．单句填空 1．Exactly________the potato was introduced into Europe is uncertain, but it was probably around 1565. 答案 when [句意：马铃薯具体是在什么时候被引入欧洲的并不确定，但有可能是在1565年左右。由句意可知，后一分句是来补充说明前一分句中的不确定的内容的，根据“around 1565”可知是对时间进行提问，因此用when引导前面的主语从句。] 2．I think________impresses me about his painting is the colours he uses. 答案 what [句意：我认为他的画给我印象最深的是他对色彩的运用。what引导主语从句，且在从句中作主语，表示“……的”。] 3．Some people believe________has happened before or is happening now will repeat itself in the future. 答案 what/whatever [句意：一些人认为，不管是以前发生的还是现在发生的事情都会在将来重现。此处“________has happened before or is happening now”是主语从句，且从句中缺少主语，故填what/whatever。] 4．________the delayed flight will take off depends much on the weather. 答案 When [句意：延误的飞机何时起飞很大程度上取决于天气状况。根据句意填连接副词When。] 5．________makes the book so extraordinary is the creative imagination of the writer. | 
