they are ________ (twin) sister.

they are ________ (twin) sister. they are ________ (twin) sisters. su hai and su yang are ___(twin)。they are ____(twin)sister they are twin "Jim and Tom are twin brothers,but they are in ________ clas liu ying and liu li are twin sister.they（）in many ways. Li Li and Liu Li are twin sister.They have some things in c_ David and Alice are twin brother and sister.They like differ Alice and her sister are twin Lily and her twin sister Liz are A and B are twin sister.twin和sister要加s吗? They are twin sisters.(改一般疑问句)