单项选择题
Throughout their history, Americans have been people（）the move.
A.in B.on C.to D.with
单项选择题 Henry Ford was himself a（）mechanic and could build a car with his own hands.
单项选择题 Jack never showed（）at the cinema, although I waited over an hour.
单项选择题 Our plane（）down at 7: 00 p.m. to be exact.
