Substitute the underlined word-segment with the most appropriate idiom:
The doctors tried very hard to save his mother but they were unsuccessful.

Underlined segment: tries very hard

Question

Substitute the underlined word-segment with the most appropriate idiom:   
The doctors tried very hard to save his mother but they were unsuccessful.

Underlined segment: tries very hard

Accepted Answer

The phrase 'moved heaven and earth' means to try very hard or do everything possible to achieve something. In the sentence, the doctors tried very hard to save his mother, so this idiom fits perfectly. 'Faced the music' means to accept the consequences, 'drew the line' means to set a limit, and 'ran like clockwork' means something worked perfectly and smoothly, none of which match the context here.

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