the red pen is five yuan .the green pen is ten yuan.(连成一句) the red pen is of the two.
问题描述：
the red pen is five yuan .the green pen is ten yuan.(连成一句) the red pen is of the two.
中间2个词
答
the red pen is five yuan .the green pen is ten yuan.(连成一句)
the red pen is （the cheaper ）of the two.