Question

select the three adjectives. dont select any articles (a, an, or the). a thick tangle of ivy covered the iron gate so completely that the gate was barely visible to anyone.

Explanation:

An adjective describes a noun. In the sentence, "thick" describes the "tangle", "ivy" is a type of plant (noun), but here "ivy" is used as an adjective to describe the "gate" (ivy - covered gate), and "iron" describes the "gate".

Answer:

thick, ivy, iron