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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Apart from technological development, the 20th century _________ an enormous worldwide political, economic and cultural transformation.
Starting Monday, all foods __________ “organic” must be up to the strict national standards that the government decided to put into effect now.
We all know the dangers of an earthquake: the _____ to buildings, the troubles can be caused by falling trees, and the terror occurs when the earth actually opens up.
To live with a family whose native language is English is the ideal way to further improve one’s English and to gain _____ into its culture.
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