根据对话内容,连一连。
A: Mum, I want to go on a trip to Shanghai. Let's go by plane.
B: No, Tom. It costs so much. Let's take a bus.
A: No, Mum. A bus is too slow.
B: Okay. Let's take a train. It's cheaper than a plane and faster than a bus.
A: All right! Let's take a train.
1. Tom and his mother want to go to plane.
2. Tom wants to go by bus.
3. Mum wants to go by Shanghai.
4. Tom and his mother will go there by train.
a. bicycle
b. train
c. taxi
d. plane
e. ship
f. bus 
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