Arrange the given words in the sequence in which they occur in the dictionary.
Regular

Rehearse

Regard

Refugee

Refine

To arrange the words according to English dictionary order, we compare them letter by letter from left to right:
All words start with 'Re-'. Let's look at the third letter:

Regular

Rehearse

Regard

Refugee

Refine

Comparing the third letters ('f', 'g', 'h'): 'f' comes first, then 'g', then 'h'.

Step 1: Compare words starting with 'Ref-':

Refi... ('i' comes first)

Refu... ('u' comes next)
So, 5 comes before 4. Sequence so far: 5, 4

Step 2: Compare words starting with 'Reg-':

Rega... ('a' comes first)

Regu... ('u' comes next)
So, 3 comes before 1. Sequence so far: 5, 4, 3, 1

Step 3: The remaining word is 2 (Rehearse) which has 'h' as the third letter.
So, the final sequence is: 5, 4, 3, 1, 2