第二节 完形填空（共20小题，每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中选出能填入相应空白处的最佳选项。
As a saying goes, every bean has its black. It is impossible to make no mistakes all one’s life. My grandpa Nybakken, a carpenter, is no 36 . Several decades ago he made a mistake –a（n）perfect mistake, 37 .
On a cold Saturday, Mother’s father was building some wooden cases for the clothes his 38
was sending to an orphanage（孤儿院）in China. On his way home, he 39 into his shirt pocket to find his glasses, but they were gone. He remembered putting them there that morning, so he drove back to the church. His 40 proved fruitless.
