Match the words with the definintions(填写大写的字母序号)A. countryside B. pollute C. transport D. hire E. securityF. bookG. claimH. downtownI. boardJ. baggage1. make dirty or make (air, water,etc.) unfit for use ______________2. get on or into (a ship, train, plane, etc.) _______________3. get the use of sth. for a special occasion on payment of a sum of money ________________4. give or receive an order ______________5. land outside the cities and towns _____________6. say that sth. is a fact _______________7. all the bags, etc. with which a person travels ______________8. to or in the center of a city ______________9. carry (goods, persons) from one place to another ____________