Gloria: I don't want to get alien friend.
Correct: I don't want to have an alien friend.
Explanation: We say "to have" instead of "to get'.The article  "an" signals  that the noun modified is indefinite, referring to any member of a group.

Gloria: Because I think alien is scary(?) like that? 
Correct: Because I think an alien is scary.
Explanation: The article  "an" signals  that the noun modified is indefinite, referring to any member of a group.

Gloria:But, ET is okay.
Correct: But, E.T is okay.

Hello, Gloria! Thank you for submitting your homework. I want you to know that teacher is also afraid of aliens. We're on the same track. Just kidding. Anyway, please take note of the corrections. Great job, Gloria!

-Teacher Isabel