1. Thomas Watson was Bell’s _______. * A.distance B.inventor C.assistant D.invention 2. It only takes one match _______ a fire. * A.to cause B.causing C.cause D.to causing 3. It’s safe _______ medicine in locked cupboards. * A.keeping B.kept C.keep D.to keep 4. “Why did you come late?” – “_______.” * A.Because I met a friend B.No, I don’t C.Because I like D.Yes, I do 5. Remember to cover ______ sockets. They are dangerous for children to put anything into them. * A.electric B.electrical C.electricity D.electrify 6. Keep those medicines _______ the children reach. * A.off B.out of C.out D.beside 7. Let’s paint the house _______. It will be much cheaper. * A.yourself B.herself C.ourselves D.themselves 8. “May I help you?” – “________” * A.What can I do for you? B.I’m afraid I’m busy now. C.Yes. That’s very kind of you. D.How can I help? 9. We must be there _______ 8.30 and 9.15. * A.on B.in C.after D.between 10. She let her child _______ with Ipad. * A.play B.plays C.playing D.to play