NDA English Comprehension

Magda : Good morning, Mrs. Smiles. It's wet. isn't it?
Mrs. Smiles : Yes, it is. isn't it? How are you today? All right? You haven't been studying too hard, have you? You look a bit pale.
Magda : I don't, do I? Well, I haven't been out much lately. I don't like this weather a bit. Why, we haven't had a dry day for weeks, have we?
Mrs. Smiles : No, I don't think we have, Let's see, you'll be going back home next month, wont you?
Magda : Oh no, I’m not going back yet. My sister's coming over first.
Mrs. Smiles : Oh, is she? You're looking forward to that, I expect. How long is it since you saw her?
Magda : Nearly a year now Yes, I am looking forward to it very much.
Mrs. Smiles : Site’s coming over here to study?
Magda : Yea, that's right. I shan't go back home until she’s sell led down. I don't think ought to, ought I?
Mrs. Smiles : Well, no, she's younger than you are, is she?
Magda : Yes, sh e’s only eighteen.