Thanks for your endeavor. But in Oxford Advanced Learner's, some pronunciations by the female actor are cot-caught merged, while others by the male actor are not so. I think they recorded only some of them following cot-caught merger. I couldn't find Cambridge Advanced Learner's online dictionary. I guess cot-caught merger's percentage will overturn non merger in the near future.
Anyway, here on this website, I learned from some teachers that America doesn't have any standard language, respecting each state's accent as it is, so whether cot-caught merger is higher in percentage or not, I feel we should respect both ways equally.
- For Teachers