问题描述：
6 ________Peter was sleeping; a thief broke into his house.7 It snowed ________ we arrived in Tokyo.8 She left her hometown________ she was five.
9 I was studying in the library__________ the UFO landed.
10.What were you doing ______ the big earth-quake happened?
9 I was studying in the library__________ the UFO landed.
10.What were you doing ______ the big earth-quake happened?
问题解答：
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