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The faster way to travel in a city is by subway. In many big cities, there   1   usually more than one subway lines.
How to travel by   2   ? Here is something to know   3   you travel by subway. First, you should choose the right line.
If you don't, you will have to get off and take   4   one. Second, you need some coins  (硬币) to buy your   5   . In   6   
of the ticket machines, only coins are used. You can change (换)   7   at the ticket office. If you have a prepaid (预付款)
card, you can just go ahead. After you buy the ticket, you should   8   the train behind a yellow line. You   9   stand too
close to the yellow line. It's   10   .
(     )1. A. have
(     )2. A. subway
(     )3. A. after
(     )4. A. the next
(     )5. A. food
(     )6. A. most
(     )7. A. money .
(     )8. A. look for
(     )9. A. must
(     )10.A. dangerous

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