题目内容
It is ______ for every family to make earthquake emergency plans and know how to leave the area during the chaos following an earthquake.
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Economists are interested in all the factors that can help to ______ the extent to which a price change will affect supply and demand in the market.
Starting Monday, all foods _______ “organic” must be up to the strict national standards that the government decided to put into effect now.
There is more to a woman than her looks, so I _______ the fact that after a woman grows old and loses her looks people stop paying attention to her.
Apart from technological development, the 20th century ________ an enormous worldwide political, economic and cultural transformation.
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