Dialogue: Sophie: I can't find my wallet anywhere! Have you seen it? Alex: Did y...

Questão de Inglês da banca AMEOSC aplicada no concurso Prefeitura de Santa Helena SC (2023). Confira a resolução completa abaixo:

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"?