需要填几个词?没有限制的话,那可就有好多选择：
1.Not right now.
2.I will in the future.
3.T've been thinking about this.
etc.etc.谢谢你的回答，不过答案应是That's too expensive.That's too expensive 同 I don't have so much money 的意思是一样的，两句用在尤其点的多余。