XI. Fill in each numbered blank with a suitable word in the following passage. (20 points)        Most people know that cigarette smoking is harmful to their (1) _______ Scientific research shows that it can (2) ________ many kinds of diseases. In (3) ________, many people who smoke get lung cancer. Doctors believe that it may also cause lung cancer in people who do not  (4)_________. Nonsmokers often breathe in the smoke from (5)_________ people’s cigarettes. This is secondhand smoking. People are becoming very aware of the danger of (6)________ smoke. As a result, they have passed laws that prohibit (7)________ from smoking in many public places. Besides, many government tend to put taxes on cigarette (8)________ as to discourage people from smoking. With all the concerted efforts (9)________by  the authority and non-smokers, we can look (10)_________ to the world without smoking.