reason的形容词形式是什么

　　例句：

　　You get a good meal for a reasonable price.

　　你能以公道的价格好好地吃一顿。

　　We sell good quality food at reasonable prices.

　　我们以公道的价格出售优质食品。

　　Public spending must be kept within reasonable bounds.

　　公共开支必须控制在合理的范围内。