Which sentence is in passive voice?

Which sentence is in passive voice?

Ancha is a nice girl.

Tete attracts a lot of tourists.

The book was sold.

This boy is my cousin’s friend.

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Exame 1ª Época Ingles 12ª 2014 - MINED

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Who -------- you that Charles is at university?

Zambézia province is the largest producer -------- coconuts.

I have got Helena´s keys. I have to give -------- to her.

If I were you, I -------- that coat. It is too expensive.

Who is the addressee of this document?

When I said I failed, my brother thought it was a joke. Then he realised that I was
speaking --------.