Fifty years ago, people \(1\) _____ write letters to their friends. They \(2\) ______ write emails.

• \(1\) used to \(2\) didn't use to
• \(1\) didn't use to \(2\) used to
• \(1\) used to \(2\) used to
• \(1\) didn't use to \(2\) didn't use to