完形填空。 There are different kinds of trains in the world. Trains can 1 people, animals, and other things. Some trains are 2 , the others are slow. They can reach most of the cities and towns. Some trains go 3 the hills if they are too high to go over. In big cities, the streets are usually 4 and some cars and buses often have to wait. So you can find trains under the 5 and trains on a rail above the streets. People can quickly be brought in or taken out. Can a train run over 6 ? Yes, it can.  There are many bridges over the rivers.  But it is not easy to 7 bridges. Today's trains have dining-rooms for people. You may 8 something in them on the way if you are hungry. Trains are 9 to men, women and children. Many children like to play with model trains. With the model trains they can build their own rails and 10 thewonderful world of trains. (     )1. A. carry (     )2. A. help (     )3. A. through (     )4. A. full (     )5. A. seas (     )6. A. water (     )7. A. mend (     )8. A. cook (     )9. A. useful (     )10.A. hate B. take B. expensive B. among B. dirty B. farm B. air B. watch B. eat B. polite B. are afraid of C. bring C. fast C. during C. free C. ground C. forests C. reach C. find C. bad C. get on well with D. hold D. empty D. above D. busy D. gardens D. mountains D. build D. pick D. lucky D. enjoy