The house … he lives is spacious.

Analyze the question: We need a word or group of words that links "The house" to "he lives is spacious." This is a relative clause, so we must pick the option that fits grammatically after "The house ..... he lives."

Concept: "Live" is an intransitive verb that takes the preposition in when we talk about a place (live in a house). In a relative clause, the preposition can come before "which" (in which), or the relative adverb where can replace "in which."

So the full forms are:

• The house in which he lives is spacious.
• The house where he lives is spacious.
• The house that he lives in is spacious (the preposition is left at the end).

Check each option:

• A. that: "The house that he lives is spacious" is incorrect, because the preposition "in" is missing.
• B. where: "The house where he lives is spacious" is correct, because "where" means "in which."
• C. by which: "The house by which he lives" is wrong in meaning. It suggests he lives by means of the house.
• D. to which: "The house to which he lives" makes no sense, because we don't "live to" a house.

Answer: B. where

Exam tip: When a relative clause describes a place and the verb needs "in" (live in, stay in), use where or in which. "That" only works if you add the preposition at the end ("...that he lives in").