单项选择题
Jack never showed（）at the cinema, although I waited over an hour.
A.off B.in C.on D.up
单项选择题 Our plane（）down at 7: 00 p.m. to be exact.
单项选择题 Antarctica is the most（）continent on the planet.
单项选择题 （）I tell you yesterday not to touch that dog!
