问题标题：
【Makeupthewordsthatareomitted1.Theboywillmakealotoftroublewhenleftalone.2.Whentakenaccorgingtothedirections,thedrughasnosideeffects.3.Ifnecessary,thisoldbuildingwillberebuilt.4.Youshoulddotheexperimentastoldto.】
问题描述：
Makeupthewordsthatareomitted
1.Theboywillmakealotoftroublewhenleftalone.
2.Whentakenaccorgingtothedirections,thedrughasnosideeffects.
3.Ifnecessary,thisoldbuildingwillberebuilt.
4.Youshoulddotheexperimentastoldto.
侯宇回答：
1.Theboywillmakealotoftroublewhen【heis】leftalone.
2.When【itis】takenaccorgingtothedirections,thedrughasnosideeffects.
3.If【itis】necessary,thisoldbuildingwillberebuilt.
4.Youshoulddotheexperimentas【youare】toldto.
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