—At least one year, I guess.

　　答案：before　句意：——“你认为再过多久股票市场会回归正常？”——“我猜至少一年。”此处应用before引导时间状语从句，表示“再过多久才……”。

　　10．Water, when________(heat) enough, can change into vapor quickly.

　　答案：(it is) heated　句意：加热时，水会变成水蒸气。water与heat之间为逻辑上的动宾关系，故用过去分词表被动，when heated为when it is heated的省略。

　　Ⅱ.语法填空，篇章训练

　　阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

　　__1__ artist had a small daughter.Sometimes he painted women __2__ any clothes on，and he and his wife always tried to keep the small girl out __3__ he was doing this，“She is __4__ young to understand，”they said.

　　But one day，when the artist __5__(paint) a woman with no clothes on，he forgot __6__(lock)the door，and the girl suddenly ran into the room.Her mother ran up the stairs __7__(stop)her, but when she got to the room，the little girl was already in the room and looking at the woman.Both her__8__ waited for her to speak.

　　For a few seconds the little girl said __9__，but then she ran to her mother and said __10__(angry)，“Why do you let her go about without shoes and socks oil when you don't let me？”

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