题目内容
If an earthquake occurred, some of the one-storey houses ________.
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The professor picked several students ________ from the class and asked them to help him with the experiment.
Every year there is some ________ of the laws.
Some people believe that proficiency in a foreign language is not achieved through teaching and learning but ________ through actual use.
It is said that somewhere between the ages of 6 and 9, children begin to think ________ instead of concretely.
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