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 of the numbered blanks The leading causes of (23) ______ 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 (24)______ can not rid (25)______ habits harmful to their health. Surgery is the only (26)______ to offer any chance of survival for people (27) _____