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1)Police said the accident occurred about 4∶30 p.m．

2)This small tree also occurs in central and southern India．

3)The though of giving up never occurred to me．

occur為不及物動詞，“to happen, especially unexpectedly”，如上面例句中的________；“come into sb's mind suddenly”，如上面例句中的________；“to exist or be found somewhere”，如上面例句中的________。