Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 11 to 15.

1. Mark: Why online learning?
2. Ann: I Think, I'll try online learning.
3. Mark: What are you going to do to get Ielts 7.0?
4. Mark: I think online platforms are too expensive. I don't think I'll try them.
5. Ann: Teachers are all native speakers, and they have flexible schedules.