根据对话音频填写文中所缺内容：
A: Look! It is not working well. Did you try out the bike when you bought it.
看，这两自行车不好用，你买的时候没试用吗？
B: No, there's no need. We can change it within two days if it's not damaged.
是的，没有必要。如果车子有问题，没有损坏的话，可以在两天内更换。
A: But it would ________________ if you had taken it for a test ride.
但是如果你试一下的话，会省去很多麻烦。
B: I know. I will pay attention to such a thing next time.
知道了，下次我会注意的。
参考答案: