Step 1: Understanding the Question:
The task is to fill in the blank in each word with a single letter to form a meaningful English word.
Step 2: Detailed Explanation:
(i) Pe_ple: The missing letter is 'o'. The complete word is People, which refers to human beings.
(ii) Mat_h: The missing letter is 'c'. The complete word is Match, which can mean a game or a device for lighting a fire. Another possibility is 'h' to form 'Math', a subject. However, 'Match' is a more general vocabulary word.
(iii) Hou_e: The missing letter is 's'. The complete word is House, which is a building for human habitation.
(iv) Ad_lt: The missing letter is 'u'. The complete word is Adult, which refers to a fully grown person.
Step 3: Final Answer:
The completed words are:
(i) People
(ii) Match
(iii) House
(iv) Adult