First（第一）

I am the first one to arrive here.

She was elected as the first in our class.

Second（第二）

He won the second place in the race.

The second book on the list is the most interesting.

Third（第三）

The third student in line is my friend.

They chose the third option as their plan.

Fourth（第四）

The fourth floor is the most quiet.

She is the fourth tallest student in our school.

Fifth（第五）

Xiaoming is the fifth tallest student in our class.

They finished the race in fifth place.

希望这些例子对你有所帮助!