text: First you were talking about apples, then you switched to grapes.  That's not a grammar correction, but just letting you know your story starts off confusing.\n\nHere's my corrections (including changing apples to grapes) with my corrections in ALL CAPS so you can see them easily.  Of course, you shouldn't write them in all caps for your assignment!  :-)\n- - - - - - \n\nGRAPES, which are my favorite fruit, are the best-selling products in the Giant Market. Among them, Grace, the ugly-looking GRAPE, is the only one who looks different from the other grapes. The other grapes have a red skin, but she has a black skin. Everyone always teases her BECAUSE she DOESN'T HAVE red skin, and she IS always being left out. By the end of October, Chris, A good-looking GRAPE, is transferred to the GIANT Market. During the reception dinner on Saturday, Grace and Chris get to know each other. Chris thinks that Grace has a good personality and he invites her to his room to have dinner together. Even though everyone tells him not to HANG OUT with her, he wants to become FRIENDS with her. After they have dinner together, they become closer and closer. Grace becomes FRIENDS with CHRIS; however, she IS STILL NOT ABLE TO GET closer to THE other grapes. Finally, the other grapes apology for being mean to her.\n\n- - - - - - \n\nOr did you really mean that Grace and Chris are apples, but the grapes who have BLACK skin tease Grace because she has red skin?  If that's the case, then use the following mark-up:\n\nApples, which are my favorite fruit, are the best-selling products in the Giant Market. Among them, Grace, the ugly-looking apple, looks different from the grapes. The grapes have a black skin, but she has a red skin. Everyone always teases her because she doesn't have black skin, and she is always being left out. By the end of October, Chris, a good-looking apple, is transferred to the Giant Market. During the reception dinner on Saturday, Grace and Chris get to know each other. Chris thinks that Grace has a good personality and he invites her to his room to have dinner together. Even though everyone tells him not to hang out with her, he wants to become friends with her. After they have dinner together, they become closer and closer. Grace becomes friends with Chris; however, she is still not able to get closer to the grapes. Finally, the grapes apology for being mean to her.