In the nineteenth century, people \(1\) _____ travel to America by boat. They \(2\) ______ fly.

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