I'm trying for the first time.

We will celebrate on the eleventh day.

You can receive first class service at this hotel.

Today is the thirty-first day.

Today is the sixty-first day. Do we have a plan to celebrate?

We celebrated our seventy-first anniversary.

In the early years of the twenty-first century, technological advancements progressed rapidly.

We celebrated our fifty-first anniversary.

The student in the ninety-first place was successful in the exam.

We examined the first-class objects.