Read the following passage and choose A, B, C, or D to fill in the gaps:
The leading causes of (41) ………….. in many developing countries are now heart disease, cancer, accident, flu, pneumonia, etc. Moreover, cigarettes, alcohol, physical inactivity, and overeating also add to the causes of several of these killing diseases. Medicine has little help to offer, however, to persons (42) ………….. can not get rid (43) ………….. habits harmful to their health. Surgery is the only (44) …………..to offer any chance of survival for people (45) …………..lung cancer.
Although psychiatrists tried to stop people (46) …………..drinking, they haven't been very (47) …………... Neither have doctors. How then (48) ………….. our health be improved? The answer is simple, though perhaps not very pleasing. Ordinary persons can do it (49) …………... They (50) …………..able to make good advances in the prevention of diseases.

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