Complete the Past Perfect questions with the correct word combinations.

Choose the correct option.

[Had completed they|Had they completed|They had completed] the project by the time the deadline arrived?

[When she had discovered|Had when she discovered|When had she discovered] the hidden treasure in the attic?

[Had Emily informed|Emily had informed|Emily informed had] you about the change in plans before you knew about them, [she hadn't|hadn't she|she]?

[Had the film started|The film had started|Had started the film] when you got to the cinema?