Matter is the name ________ （give） to everything which has weight and occupies space.
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如果队员意外地将球投入该队的本方球篮，对方得分有效（）
he teacher told them since light ________ （travel） faster than sound,lightning ________ （appear） to go before thunder.
《煤矿安全规程》规定井下粉尘浓度每月必须至少测2次（）
The director recommended that she ________ （study） more English before going abroad.
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