1. Smoking does great harm to one’s health and it will ___ one’s life. A. enrich B. enlarge C. shorten2. Women smokers are ____ likely to suffer from cancers caused by smoking. A. more B. not C. less3. Most of the doctors and researchers who have done such experiments advise people ____ . A. to give up smoking B. to start smoking C. to keep on smoking4. Cigarette makers use filters to ____ poison. A. ger rid of B. reduce C. stick to5. Lung cancer and throat cancer are ____ caused by smoking. A. mainly B. totally C. not