填空题 Most smokers want to stop smoke. Many of 77. ______
them have tried more than once but failed. 78.______
Although they know smoking may kill them and 79.______
cause a serious illness yet they can give it up. 80.______
The reason to it is that tobacco contains nicotine 81.______
that is a drug which gets one into habit of smoking. 82.______
Because you start taking the drug, it is hard to stop. 83.______
If you go without it for an hour or two, it 84.______
begin to feel bad. The only thing can stop85.______
you feeling bad is the drug containing in cigarettes. 86.______