1.
read the sentence.
the roller-coaster ride is popular.
what kind of complement is the word in bold?
indirect object
predicate adjective
objective complement
predicate nominative

Even though there is no word in bold, the complement is formed by a single word: “popular.” Thus, we can assume that the word that should be in bold is “popular.”

Predicate adjective

Explanation:

A predicate adjective is an adjective that modifies or describes the subject of a sentence and that is placed after a linking verb. Linking verbs are those expressing conditions or states (not actions), like the verbs "to be," "to become" and "to seem." In the sentence, “popular” is a predicate adjective because it follows the linking verb “is” and it describes the subject “The roller-coaster.”

b. our party quickly made its way into the cave / but we failed to find our host [the cyclops] himself inside.