Chinese people invented _________.A.print B.printing C.printed
He lived ________ a big cave.A.in B.on C.at
Peking Man lived about 300,000 ________ 500,000 years ago.A.from B.to C.for
What's your mother's ________?A.work B.do C.job
What class are you ________?A.at B.in C.on
How old ________ your brother?A.is B.are C.does