【简答题】

短文改错：
Most smokers want to stop smoke.Many of   56._______
them have tried more than once but failed.  57._______
Although they know smoking may kill them and   58._______
cause a serious illness yet they can give it up.  59._______
The reason to it is that tobacco contains nicotine  60._______
that is a drug which gets one into habit of smoking.  61._______
Because you start taking the drug，it is hard to stop.  62._______
If you go without it for an hour or two，it   63._______
begin to feel bad .The only thing can stop   64._______
you feeling bad is the drug containing in   65._______