本世纪

世纪 shìjì HSK 3 #2,099

century

上世纪 shàngshìjì

the last century / the previous century (i.e. the 20th century, from a 21st-century viewpoint)

中世纪 zhōngshìjì #9,880

the Middle Ages; medieval period

20世纪 èrshíshìjì

the 20th century (1901-2000)

21世纪 èrshíyīshìjì

the 21st century (2001-2100)

本事 běnshi HSK 3 #4,014

ability; skill; capability / real ability; what one is actually capable of

本身 běnshēn HSK 6 #3,157

itself; in itself; per se / one's own; oneself

本次 běncì #8,147

this time; the current (occasion) / the present (event/session)

本该 běngāi #5,148

should have / ought to have / was supposed to

本能 běnnéng HSK 7-9 #5,166

instinct