Vocabulary and collocation – travel planning: select the best adjective to complete "make ____ arrangements …" for a backup plan when a car is unavailable. Full sentence: "If our friends are not able to take us in their car, we must make ____ arrangements to go to the airport." Choose the word that fits standard English usage and meaning.

Given data

• Sentence context: planning a backup when friends cannot drive us to the airport.
• Options: alternative, another, alternate, possible.

Concept/Approach
Make alternative arrangements is a fixed, natural collocation meaning "arrange a different plan". Another arrangements is ungrammatical (number mismatch), and alternate commonly means "every second" (AmE also "alternative" but less natural in this collocation). Possible does not capture the idea of a Plan B.

Option analysis
alternative — standard collocation: make alternative arrangements. ✅another — would require singular arrangement to agree in number; also loses the nuance of a backup plan.alternate — chiefly means "every other"; not idiomatic here in most varieties of English.possible — too vague; does not convey the "backup" sense.

Common pitfalls

• Confusing alternate with alternative.
• Number disagreement: another arrangements ❌ vs. another arrangement ✔ (but still semantically weaker).

Final Answer
alternative