4 Zakreśl właściwą odpowiedź.
1 Gravity was discovery/discovered
by Newton
2 Camera phones weren't/ aren't
produced before the 21st century.
3 Tik Tok is used / using by millions
of teenagers around the world,
4 A hundred security cameras was
were installed in our school last year,
5 The telephone wasn't invent/
invented by Edison

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