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1 . This book, ______ you can buy at any bookstore, will provide you with all the information you need. (用适当的词填空)
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2 . Town twinning is an agreement between two towns or cities of similar size and age, ________ have similar features. (用适当的词填空)
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3 . He got 145 in the math examination, ________ made his parents very happy. (用适当的词填空)
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