Explanation:
The task requires filling in the blanks with appropriate personal pronouns (I, he, she, they, it) and forms of the verb 'to be' (am, is, are) to make the dialogues grammatically correct and logical.
Dialogue A: The speaker is talking about themselves (age and class), so 'I am' and 'She is' are used.
Dialogue B: The conversation is about 'Dan', a male subject, so 'he is' and 'Is he' are used.
Dialogue C: The conversation is about 'Tom and Carrie' (plural), and then 'Green School' (singular, non-human). Therefore, 'They are' and 'It is' are the correct choices.