1．Smoking and alcohol drinking injure one's health a great deal，and therefore (因此)should be given up.
2．Flooding is likely in some coastal region (地区) of the northeast during the early part of the week.
3．We plant trees every year so as to protect the soil (土壤) on the hill.
4．This kind of stamp is designed (设计) by some students who are learning art at our university.
