Theworld'spopulationisconsideredtopass7onOctober31asitheadstowardsmorebytheendofthecentury.A.billionB.billionofC.billionsofD.billions
The world's population is considered to pass 7______on October 31 as it heads towards
more by the end of the century.
A. billion B. billion of C. billions of D. billions
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