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　　1. Exactly _____ the potato was introduced  into Europe is uncertain, but it was probably around 1565. (2014´ó¸Ù)
　　2. I think _____ impresses me about his painting is the colours he uses. (2014Ìì½ò)            
　　3. _____ we understand things has a lot to do with what we feel. (2015±±¾©)
　　4. _______ Li Bai, a great Chinese poet, was born is known to the public, but some won¡¯t accept it. (2015½­ËÕ)
　　5. It is often the case ______ anything is possible for those who hang on to hope. (2016½­ËÕ)
　　6. Your support is important to our work, _________ you can do helps. (2016±±¾©)
　　Read the passage and choose the suitable clause for each blank.