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haunted
['hɔntəd]
became more and more haunted by the stupid riddle
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obsessed
[ə'bsɛst]
was absolutely obsessed with the girl
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preoccupied
[pri'ɑkjəˌpaɪd]
got no help from his wife who was preoccupied with the children
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taken_up
he was taken up in worry for the old woman