This should help guide your answers:
Declarative: This is simply a statement and is punctuated with a period at the end.
Examples: I read a book. She walked down the street.
Interrogative: An interrogative is a question, and is punctuated with a question mark.
Examples: How are you doing? What is his problem?
Imperative: This is a command or request. Typically it's punctuated with a period.
Examples: Please ask your mother. Come here right now.
Exclamatory: These are statements full of emotion or excitement and are punctuated with an exclamation mark.
Examples: I'm so happy right now! This tastes terrible!