Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each numbered blank. Scientist used to believe that our 24-hour cycle of sleeping and walking was governed entirely external factors. The most notable of these, they thought, were the rising and __( 23 )__ of the sun. But they have now assured that there is a daily rhythm to a wide range of biological functions - including temperature, digestion and mental activity The main function of this “body clock” is to anticipated and __( 24 )__ for external changes so that, for example, body temperature starts to rise __( 25 )__ dawn, gearing us up for the day, and begins to fall in the early evening, winding us down for sleep. Some people’s body clocks keep poorer time than others, which can greatly disturb their lives and even __( 26 )__ their health. Insomnia, depression, fatigue, poor work performance and even accidents can all be___( 27 )__ or aggravated by inaccurate body clocks. Question23: A. dipping B. descending C. setting D. diving Question24: A. prepare B. dispose C. scheme D. steady Question25: A. nearly B. beside C. approximately D. around Question26: A. spoil B. risk C. injure D. threaten Question27: A. formed B. made C. caused D. put