Final answer:
The correct answer to fill in the passage is Option A: 'to, their.' 'To' indicates motion towards a place, and 'their' is a possessive pronoun.
Step-by-step explanation:
The correct way to fill in the passage is: We went to their house. The first blank should be filled with 'to' because it is a preposition indicating direction or motion towards a place. The second blank should be filled with 'their' because it is a possessive pronoun indicating that the house belongs to them. Therefore, the correct answer is: A. to, their.
When choosing between 'to', 'too', and 'two', remember that 'to' is often used as a preposition or as part of an infinitive, 'too' means 'also' or can imply excessiveness, and 'two' is the numerical value representing the number after one and before three.
'Their', 'there', and 'they're' can also cause confusion. 'Their' is a possessive pronoun, 'there' indicates a place, and 'they're' is a contraction meaning 'they are'.