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单词拼写
根据所给中文意思拼写单词，使句子完整、正确、通顺
He lives on the ________(十二) floor of the building.
There are ________(千) of trees on the hill.
Computers were used more widely at the ________(开始) of the twenty-first century.
Children enjoy ________(放) kites in spring.
When I walked ________(经过) the house yesterday. I heard someone singing in English.