题干
阅读短文，从方框中选出适当的动词,并用其适当形式填空。有的需要加助动词或不定式符号（每词限用一次）。
retire go work catch stop |
Mr. Smith ____ in a police station for 42 years and he will retire this autumn. He tried to work hard in his life but he wasn't lucky enough ____even a thief.
Last weekend, Mr. Smith ____ to buy some sugar in a shop. When he got into the shop, he suddenly saw a young man get some money from a woman's bag and walk away. He ran to the thief and at the end of a blind alley(死胡同), the young thief ____by Mr. Smith.
“Please give me a chance, sir,” said the thief. “I'll never do that again!”
“But who can give me a chance?” said Mr. Smith. “I____ next month and this is the first time I've caught a thief!”
答案(点此获取答案解析）
has worked,to catch,went,was stopped,will retire
，是一种常见的有机溶剂，它可以通过下列三步反应制得： 
，下列相关说法中正确的是（ ）
