Ответ:

  1. giraffe — the other animals are mentioned in the passage’s immediate context only if the source vocabulary set is known; the exercise key cannot be confirmed from this page alone.
  2. animal — the others are plants or vegetation.
  3. happy — the other words describe unpleasant or negative states.
  4. hit — the other words begin with the letter combination h followed by a vowel sound pattern differing from “hit”; the intended criterion cannot be confirmed without the preceding vocabulary exercise.