I. Multiple Choice: 1.As a student, you _____ hard to please your parents. A. ought to working B. ought working C. ought to work D. ought work ______ 2.It is safe ___ medicine in locked cupboard A. putting B. to put C. put D. puts ______ 3.The children are old enough to take care of _______. A. ourselves B. himself C. myself D. themselves ______ 4.You must cover all _______ socket in your house. A. electrical B. electrify C. electricity D. electrician ______ 5.Don’t let your little brother play with ballpoint pen. They can _____ him. A. injure B. destroy C. take D. put ______ 6.It only takes one match to _____ a fire. A. cause B. destroy C. happen D. play ______ 7.You have to keep all dangerous objects ______ children’s reach. A. from B. for C. out of D. of ______ 8.____ the right side of the room, there is a window. A. On B. At C. With D. In ______ 9.Staffs _____ smoke when serving customers. A. must B. must not C. have to D. don’t have to ______ 10.Let’s paint the house _____. It will be much cheaper. A. ourself B. ourselves C. yourself D. myself