A: _____ century is it now? B: It is _____ . A: What _____ the last century? B: It was _____ .
What / the 21st century / was / the 20 century
What / the 21st century / was / the 20th century
What / the 21 century / is / the 20 century
When / the 21st century / was / the 20th century