根据各组对话内容，从下面提供的5个选项中选出能填入空白处的最佳选项，并将该选项前的字母填写在答题卡相应的位置上。A．Sure．What is it?B．It’s very nice of you to say so．C．It’s nothing．D．Have a nice trip!E．Certainly．Here you are．11．A：I’m leaving for Hong Kong for a weekend break．B：[11]_______12．A：Excuse me．Could you give me a hand?B：[12]_______A：I want to move this desk out of the office．13．A：I’m sorry to have kept you waiting for so long．B：[13]_______I’ve been killing time by listening to music．14．A：Could I use your dictionary，please?B：[14]_______A：Thank you．I’ll return it as soon as possible．15．A：You’ve cooked such a delicious dinner．Mrs．White．B：[15]_______