要写为什么 英语完形填空the fastest way to travel in a city is by subway

要写为什么 英语完形填空
the fastest way to travel in a city is by subway
in many big cities,there () ususlly more than one subway line.
here is something to () before you travel by subway.fist,you should choose the right line.if you don't,you will have to get () it and take anther one.second,you need to take some coins () your ticket.in most of the ticket machines,() coins are used.you can change coins at the ticket office.() you have a prepaid card,you can just go ahead.after you buy the (),you should wait for your train outside a yellow line.you mustn't walk too () to the yellow line.it's()
1.have has is are
2.where how what why
3.think know hear see
4.off up into on
5.in to for of
6.some all only any
7.if because although before
8.coin ticket things machine
9.far slowly quickly close
10.dangerous safe intersting exciting
要写为什么