21.The year I went to college was a very difficult transition(过渡期) for me.21 Is probably true with many people. I got quite homework and 22 thoughtAbout going home.Although the 23 time for many students is getting 24 from home, my mailbox was frequently 25 . One day when I went to the mailbox, there was a postcard26 out at me. I sat down to reda it, 27 a note from someone back home. 28I became increasingly puzzled(困惑) as 29 postcards were like this; It was a full news report about a woman named Mabel and her newborn baby. I took the cardBack to my room and 30 about it.Several days later I 31 another postcard, this one 32 news about Maybelline, Mabel’s cousin. Soon after, another card arrived and then another,33 full of news of different people. I befan to 34 look forward to the nextOne, 35 to see what this author would come up with 36 . I was never 37 .Finally, the cards 38 coming, right about the time I had begun to feel39 college life. They had been such a happy distraction(调剂) that I have40 all the postcards and still bring them out to read whenever I need a lift.
(A) If
(B) So
(C) As
(D) What