Complete the sentences with the correct form of the verbs (Past Perfect).

1) Before she knew it, the wind (blow) _______ her hat into the lake.
2) When Mike (explain) _______ to his parents, they said he could do his homework in their bedroom.
3) I knew I (see) _______ you before.
4) We (study) _______ until 7 o’clock and then we watch TV.
5) Nina thanked me after I (give) _______ her a birthday present.
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