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million of year million year millions years millions of years
100 years 20 years 50 years 10 years
A. was living had lived has lived lived
situation condition standard position
transformed has been transformed has transformed had been transforming
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proposed demanded made witnessed
A. was living had lived has lived lived
several hundreds English words hundreds of English words hundred of English words several hundred English word
led to the awareness of knew a great deal in is available in is equipped with
for; before not for ; that for ; when not for ; then
become turned become a turned a
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