Question

iron is dash useful material in fill up the blank a, an, or the​

Answer 1

Answer:

iron is an useful material.

Because before vowels a, e, I, o, u an is used

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Answer 2

Answer:

Iron is an useful material

Explanation:

The word useful begins with the letter u

And the letter u is a vowel. So, for the vowels we always have to use an.