Help the wizard update his magical pet journal by choosing the correct article for each blank.

Yesterday, I adopted an iguana and a tiny dragon from the magical shelter. I was completely shocked when the iguana immediately turned invisible and stole my hat!

Yesterday, I adopted an iguana...

We use "an" when mentioning a singular, non-specific noun for the first time that begins with a vowel sound (like the "i" in iguana).

...and a tiny dragon from the magical shelter.

We use "a" for a first-time mention of a singular noun that begins with a consonant sound (like the "t" in tiny).

I was completely shocked when the iguana immediately turned invisible and stole my hat!

We use "the" (the definite article) for the second mention of a noun. Since we already introduced the iguana in the previous sentence, we now know exactly which invisible reptile we are talking about!