按照句意填空(complete the conversation)

按照句意填空(complete the conversation)
mothet :i'm leaving now ,dear .can you lookafter yourself
fred :of course ,mom .don't worry how are you going there?
mother :i don't know .i think i'm going by bus .if i _________ ,it will be cheaper .
fred :but if you ___________ by taxi ,you __________ there more quickly mother :you're right .but i think i ___________ a train .it's neither too dear nor too slow .
fred :good idea .
mother :are you going out later
fred :perhaps .if i __________ ,i'll close the window and the door .
mother :ok .ifthe phone rings ,can you answer it
fred :sure ,mom .
mother :if you __________ ,you can have something to eat .i ___________ back this evening __________ the meeting ends early .
fred :yes ,mom .if you ____________ go quickly ,you'll miss the train .have a good journey