Dialogue: Sophie: I can't find my wallet anywhere! Have you...

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Q2323651 Inglês
Dialogue:

Sophie: I can't find my wallet anywhere! Have you seen it?
Alex: Did you try looking in your backpack? You might have put it there earlier.
Sophie: Oh, you're right! I just found it inside the front pocket. Thanks!

Which phrasal verb in the dialogue indicates "searching thoroughly to find something"? 
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