A．No doubt 　　　

B．No wonder 　　

C．That's because

D．It's natural

　The number of people 　　 smoke because they think that smoking is

(1)________

enjoyment, especially after 　　 meal．They also believe that when one

(2)________

feels tired or sleepy during work, this is refreshing(提神的) to

(3)________

have a smoke． As a matter of fact, smoke is a very bad habit ．First,

(4)________

doctors and scientists have discovered that it's harmful to the

(5)________

smoker's health． It must cause some serious diseases, such as heart

(6)________

trouble or cancer (癌)． 　　 Smoke will pollute the air or is also 　　 harmful

(7)________

to other's health． Second, many big fires have caused by careless

(8)________

smokers．These have resulted in losses of lives and property (财产)．

(9)________

Besides, the cigarettes are usually very expensive and smokers have

(10)_______

to spend a lot of money on them every year．Therefore, smoking is a great

waste．That's why more and more smokers are trying their best to give up smoking．

A．Come on　　　

B．It depends

C．Go ahead　　　

D．That’s great