Section C Directions: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A) , B), C) and D) . Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 16 to 18 are based on the passage you have just heard 16 A. Diseases associated with lack of sleep. B. Reasons for Americans decline in sleep. C. The importance of sleep to a healthy life. D. Some tips to improve the quality of sleep.