Let's go through each sentence and choose the correct personal pronoun. Pronouns are used to replace nouns in a sentence to avoid repetition and simplify language. In this task, we're choosing personal pronouns to replace specific nouns based on their context and characteristics.
Maria is kind. (She, He) always helps her classmates.
Here, 'Maria' is the noun mentioned. Since Maria is a female name, the pronoun 'She' is the correct choice. Therefore, 'She always helps her classmates.'
The dogs are barking. (They, It) are hungry.
'The dogs' is the noun referred to. 'Dogs' indicates more than one, hence the plural pronoun 'They' is appropriate. So, 'They are hungry.'
I saw a cat. (It, They) was sleeping under the tree.
'A cat' is a singular noun. For singular non-human subjects, 'It' is the suitable pronoun. Thus, 'It was sleeping under the tree.'
My brother and I went to the park. (We, They) played basketball.
Here, 'My brother and I' is a plural subject including the speaker. The pronoun 'We' is used for inclusive plural subjects. So the sentence is, 'We played basketball.'
Carlo is my friend. (He, She) likes to read books.
'Carlo' is a male name, and so the pronoun 'He' is appropriate. Thus, 'He likes to read books.'
In summary, the chosen pronouns are: 1. She, 2. They, 3. It, 4. We, 5. He. These pronouns appropriately replace the nouns based on their number (singular/plural) and gender.