reason的形容詞形式是什么

　　例句：

　　You get a good meal for a reasonable price.

　　你能以公道的價格好好地吃一頓。

　　We sell good quality food at reasonable prices.

　　我們以公道的價格出售優質食品。

　　Public spending must be kept within reasonable bounds.

　　公共開支必須控制在合理的范圍內。