问题描述：
1.This time yesterday,I______(show) the foreingners around the History Museum.
2.Kathy was helping his mother ______(clean) the kitchen.
3.The Oriental Pearl TV Tower ______(not open)until 8:30 a.m every day.
2.Kathy was helping his mother ______(clean) the kitchen.
3.The Oriental Pearl TV Tower ______(not open)until 8:30 a.m every day.
问题解答：
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