阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
May: Hi, Mike. Long time no see.
Mike: Hi, May!
May: Where have you been these days? It’s been quite a long time I last saw you in the library.
Mike: Well, I went to Hong Kong last month and stayed there _half a month.
May: Why did you stay there so long?
Mike: Er, I went there (attend) a meeting to discuss how to make sure of flight (safe) between countries.
May: I called you many times, but I could not get through, made me very angry.
Mike: Oh, I’m sorry. I got my phone number(change) when I was in Hong Kong so that I didn’t have to spend soon my phone calls.
May: Did you have a good time there?
Mike: Yes, a very nice time. I drove around with my friends. I also paid _visit to the Hong Kong Disneyland. It was the first time that I _(see) the sea. It’s (real) a wonderful experience.