The nature of dark matter is ______ It cannot be seen or detected directly

　　Astronomers know it is there because of its______ on celestialobjects that can be seen and measured.

　　But the most dominating force of all in the universe is called dark energy, a recently ______ power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.

　　51 A worry B move C puzzleD reject

　　52 A understanding B value C pattern D structure

　　53 A changedB described C designed D shaped

　　54 A in B for C ofD to

　　55 A make B keep C set D get

　　56 A written B called C identified D seen

　　57 A signed B stressed C acted D played

　　58 A believe B owe C feel D regard

　　59 A appearedB carriedC published D contributed

　　60 A elementB shape C formation D power

　　61 A with B as C form D beside

　　62 A turned B workedC led D attempted

　　63 A unknow B interesting C different D visible

　　64 A form B outcome C effect D source

　　65 A seized B provenC caught D grasped

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