根据短文内容选择可以填入空白处的最佳答案。

　　Mr．Thomas and his wife had taken their nine-year-old grand-daughter to Paris for a short holiday．One morning they set off for a 　　1　　 on one of the Metro lines where the trains run on rubber wheels．In changing from one line to 　　2　　, the child was 　　3　　 behind on the platform in the rush to get on the train．　　4　　 that Mr．and Mrs．Thomas could do was 　　5　　 out at the next station and ask a station official to telephone back to 　　6　　 the child taken care of．They caught the very 　　7　　 train back and felt pleased to see the little girl 　　8　　 patiently on a bench on the opposite platform．

　　　　9　　 they had crossed 　　10　　, the child had vanished．An official told them that he had 　　11　　 her(in French, of course)and she had immediately run away．　　12　　 followed an hour of searching every passage in the station until 　　13　　 Mr．Thomas went to the police, who agreed to 　　14　　 the search．One police officer had the 　　15　　 idea of telephoning the hotel where they were staying．What a relief to hear that the child had been saved by a kind young lady and brought back to the hotel! The child, who spoke no French, had given the name of the Metro station near the hotel．

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