完形填空。 Would you like to travel to Hong Kong? In Hong Kong, there are many cars and buses. Different from many places of China, you must keep to the 1 side of the street in Hong Kong. If you want to cross a street, you must be very 2 . Before you cross the street, you have to stop and look to the right 3 and then the left. If the traffic lights are 4 , the traffic must stop. Then passers-by can cross the street. If the traffic lights are green, the traffic can 5 . When you are in Hong Kong, you should learn how to 6 the bus and the subway. The 7 important of all, you must know in which 8 you are going and which bus or which subway you should take. When you wait for your bus at the bus stop, you shouldn't 9 . When you get on the bus, you must 10 your ticket first of all. (     )1. A. right (     )2. A. lucky (     )3. A. back (     )4. A. red (     )5. A. fly (     )6. A. by (     )7. A. more (     )8. A. bus (     )9. A. cut in line (     )10. A. pay B. left B. safe B. first B. green B. walk B. sit B. less B. direction B. wait in line B. give C. around C. pleasant C. slow C. orange C. across C. take C. most C. street C. cut in a line C. pay for D. behind D. careful D. quick D. yellow D. go D. own D. worst D. road D. wait in a line D. cost