Let me tell you a story about Berb and Mild Carbridge, who used to be very【21】For example, Mild would forget to【22】dinner, or Berb would【23】up for work on Sunday【24】it was Monday. One summer they【25】to take a long plane trip. What do you guess happened? Well, they got to the airport with only ten minutes to【26】. So time was short. In that【27】anyone would【28】the plane right away. But not Mr. and Mrs. Carbridge. They just had to buy some flight insurance(保险)【29】. All in all, who knows what will happen on a plane flight? They quickly put some【30】into a machine and【31】came their insurance policy. 'Who【32】get the money if we【33】, I wonder?' asked Mild. 'My mother, of course,' her husband【34】. 'We'll mail the【35】to her. Now quick give me a stamp,【36】you?' he said. 'The plane's going to【37】in another minute.' Berb put the stamp on the envelope,【38】it in the mailbox, and【39】began to cry. What happened, do you guess? He had mailed their【40】to his mother! (36)