I. Choose the best answer: ( 3.0 pts) 1.I think we shouldn’t throw trash______the water. A. with B. over C. away D.in 2.What about using public buses _______motorbike? A. replacing for B. substitute C. instead of D. instead for 3. Is he interested in ________________ the other students? A. help B. helped C. to help D. helping 4. When is the __________________ coming to mend the burst pipe? A. electrician B. poet C. plumber D. preservationist 5.You should minimize your water in use. A. talk about B. come from C. turn on D. cut down 6.We have to stay at home ___________________ it is raining heavily. A. but B. however C. therefore D. because 7. Don’t be frightened! The snake is not ___________________. A. poisonous B. guilty C. direct D. viable 8. Everyone must take part in preventing ____________. A. foams B. forestation C. deforestation D. natural resources 9. The woman said she was sad that some tourists ____________ this area. A. avoided B. wandered C. spoiled D. wrapped 10.The streams will be covered ___________________ foam. A. about B. with C. for D. from