Zakreśl wyrazy, które poprawnie uzupełniają poniższe zdania.

1 Nowadays, most of the products we buy aren’t / don’t handmade.
They produced / are produced in factories on production lines.
2 The Internet didn’t / wasn’t invented until after World War II. The first networks installed / were installed in the 1960s and 70s.
3 Home computers aren’t / weren’t sold in large numbers in the 1980s. Nowadays, however, a computer or a laptop buys / is bought by someone every day!