At the railway station,the mother waved goodbye to her daughter until the train was________.
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A
out of sight
B
out of reach
C
out of order  
D
out of place
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You may ask the teacher for help ____ difficulty.
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A
in case of
B
in the case of
C
in any case
D
in no case
_____professional development, big cities appeal to many young people .
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A
In favour of
B
In terms of
C
In need of
D
In honour of