1 . 阅读下面短文，在空白处填入 1 个适当的单词或括号内单词的正确形式。
In the 1950s, a family that owned a farm near Beulah, Michigan kept a bull chained to an elm (榆树). The bull paced 1 the tree, dragging the heavy iron chain, 2 led to a groove (槽) in the bark (树皮). The groove 3 (deep)over the years. However, for whatever reason, it just did not kill the tree.
After some years, the family took their bull away. They cut the chain, leaving the loop around the tree and one link 4 (hang) down.
Then one year, one of the most historically serious agricultural 5 (catastrophe) struck Michigan in the form of Dutch elm disease. All of the elms lining the road leading to the farm became withered and died due to the 6 (infect) disease, which made people panic as well. Everyone thought that the old elm would be the next. The farm owner considered going the safe thing: pulling it out and chopping it up into firewood before it died.
7 (amaze), the tree did not die. Nobody could understand why 8 was the only elm still standing in the county. It is said that 9 doesn’t kill you will make you 10 (strong). Or, as a plant pathologists (病理学家) put it, “Life breaks us all, but afterwards, many of us are strongest at the broken places.”
