Answer:
The correct answers are:
We
Theirs
He
Explanation:
In the first and third cases, the question is looking to replace a proper noun (Cari and I, and Mr. Chen) with a subject pronoun (We, He).
In the second case, the question is looking to replace the proper nouns (David and Jessica), along with the possessive shown by the apostrophe, with a possessive pronoun (Theirs).
In both cases the meaning remains the same, without having to add context.
A subject pronoun is a personal pronoun that can act as the subject of the sentence and perform the action.
A possessive pronoun is a personal pronoun that shows possession in a broad sense and is used along with a noun that indicates the object of said possession.
