用方框中所给词语的适当形式填空，使短文正确、通顺、连贯（每词限用一次）。
   Tom got along with all of his neighbors except the man who lived next door. The man never spoke to a____  and no one knew what he did for a living.
   One day, when Tom came home f____   work, he found a diamond necklace outside his door. Tom wondered w____   it came from.
   Tom t____   that perhaps someone had dropped the necklace, s____  he planned to take it to the police station the next day. He thought the police would be able to find the o____ . Just then, the police came to Tom’s home and saw the necklace in his hand. Tom was very shocked when he was c____   with robbery. A policeman told him that a jewellery shop had been r____ . A witness said that she had s____   someone run from the jewellery shop into Tom’s building right  a____   the robbery.
Tom was not guilty, but how could he prove it?