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1 Tickets must be bought by all visitors.

All visitors must buy tickets.

2 Sue gave Tony a book as a present.

Tony was given a book as a present by Sue.

3 She's too old to start to learn the piano.

She isn't young enough to start to learn the piano.

4 Everyone in my family loves science-fiction films.

In my family, all of us love science-fiction films.

5 We'll probably visit the gallery while we're in London.

We'll probably visit the gallery during our stay in London.

6 Museum trips can teach you a lot.

You can learn a lot on a museum trip.