题目

It was already half past seven and I was running late again for the dinner appointment with my wife, Eleanor. We had   1to meet at the restaurant at seven o'clock. I felt a little uneasy, but to my   2，I had a good excuse：A business meeting had   3and I'd wasted no time getting to the dinner. When I arrived at the   4，1 apologized and told Eleanor I didn't mean to be late. She screamed, You never mean to. Well, I   5tell she was angry. I'm sorry but it was not   6, I said. Then I told her about the business meeting.   7, my explanation seemed to make things worse, 声音是由于物体的振动振动产生的；在日常生活中，人们交谈的声音是通过空气空气传播的，气温15℃时，声速为340340m/s．