Part of the reason Charles Dickens loved his own novel, David Copperfield, was ________ it was rather closely modeled on his own life.(2010·北京)
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Courage is a good quality and is ________ it takes to get over difficulties.
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Nowadays school bus safety has drawn much attention nationwide for children’s safety is _______ worries parents most.
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Einstein’s most famous theory is ______ we call the Theory of Relativity.
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