一、单选题(共 10 题)1.Sam usually finishes his work ________ 6:30 P. m. ________ Friday. A.on;onB.at;atC.at;onD.on;at2.—What are their ________?—They are policewomen.A.jobB.jobsC.nameD.names3.I ________ my work at four at my office. Then I go back home for dinner. A.startB.finishC.starti...