A: _____ century is it now?
B: It is _____ .
A: What _____ the last century?
B: It was _____ .

What / the 21 century / is / the 20 century
What / the 21st century / was / the 20 century
When / the 21st century / was / the 20th century
What / the 21st century / was / the 20th century
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