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 from 42 to 46.
Smoking causes lung cancer, heart disease, and breathing problems. Worldwide, about three million people die every year because of smoking - that's about one death every ten seconds! In fact, smoking is the (42) _____ of almost 20 percent of all deaths in the developed countries of the world. Smoking doesn't just hurt the smoker, it hurts other people, too. When a pregnant woman smokes, she is hurting her developing baby. When a man (43) _____ at home, his wife and children are also breathing in smoke can become sick. Even though most people understand the (44) _____ effects of smoke, they continue to smoke. The (45)_____ of women and teenagers who smoke is increasing, cigarette companies make advertisements that interest these groups of people so that they (46)_____ to buy cigarettes.
(42)
A.origin
B.reason
C.cause
D.basis