题目

Even as I write this story, I am still smiling. The past few weeks have been rather   41    , but when a large number of Smile Cards arrived in my   42   the other day, having traveled all the way from the United States to my home in the Netherlands, I knew things were about to    43     . I     44     where to leave the cards as I went to bed that night: the train, benches at the station, at work, libraries, mailboxes, the gym ---the possibilities   45     endless. I woke up, went to work, and afterwards, I went     46     to the shop to buy so7．一铝块在空气中称重是27N，完全浸没在煤油中称重是19N，完全浸没在某液体中称重是17N，此物体在煤油和该液体中所受浮力的比是4：5．