2 . 在空白处填入1个适当的单词或括号内单词的正确形式。
The nicotine in tobacco is 1 (harm) to people's lungs. 2 , my father used to smoke cigarettes far too often, which disturbed me greatly. One day I spoke to 3 health consultant at my school. He said my father should make a monthly plan 4 (smoke) less, otherwise he may need surgery in the future. I'm so glad my father agreed to make a plan and break this bad habit!