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Bonjour,
Réponse :
1 /Tickets must be bought by all visitors. All visitors must buy tickets.
( on met la phrase à la voix active )
2/ Sue gave Tony a book as a present. Tony was given a book as a present by Sue.
( on met la phrase à la voix passive )
3 /She's too old to start to learn the piano. She isn't young enough to start to learn the piano.
( Elle est trop âgée pour commencer à apprendre le piano. Elle n'est pas assez jeune pour commencer à apprendre le piano )
4/ Everyone in my family loves science-fiction films. In my family, all of us love science-fiction films.
( "all of us" pluriel )
5 /We'll probably visit the gallery while we're in London. We'll probably visit the gallery during our stay in London.
( "during" :pendant )
6/ Museum trips can teach you a lot. You can learn a lot on a museum trip.
( "learn" :apprendre )