从方框中选择合适的短语，并用其适当形式填空

be harmful to，cut down，turn off，pay for，take part in

We will________houses by monthly installments．
Smoking________your health．You should give up smoking．
—Do you mind if I________the light？
—Not at all．
He will________a chess tournament next week．
Lots of trees were________by the farmers．They used them to build houses．