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课时作业(二十三) [必修5 Unit 3 Life in the future] [限时：35分钟] Ⅰ.单项填空 1．—Well, honey, I'm sorry but I have to board. —________， and God bless you when you are in Libya. A．Enjoy yourself B．Do take care C．Have a nice trip D．Mind your steps 2．The train is running ________ 120 kilometres an hour. A．at a speed B．at the speed C．at a speed of D．on a speed of 3．You see the lightning ________ it happens, but you hear the thunder later. A．for an instant B．on the instant C．in a instant D．the instant 4．When ________ about one of the biggest problems today, many people say that an energy crisis is approaching and is threatening mankind's survival. A．asking B．being asked C．having asked D．asked 5．After studying in a medical college for five years, Jane ________ her job as a doctor in the countryside. A．set out B．took over C．took up D．set up 6．The ________ on his face told me that he was angry. | 
