Final answer:
Informal letter conventions and characteristics in English
Step-by-step explanation:
In an informal letter, the receiver of the letter can be addressed by their name or a term of endearment such as 'Dear John' or 'My dearest friend'. So, the answer to question 1 is 'd. Address'.
The suitable closures for informal letters are often warm and friendly. 'Lovingly' and 'Yours faithfully' are more commonly used in formal letters. 'Warm regards' would be the most suitable closure for an informal letter, so the answer to question 2 is 'b. Warm regards'.
Informal letters should have a friendly and conversational tone. They should also be brief and to the point. Therefore, the answer to question 3 is 'c. friendly' and 'a. brief'. Informal letters do not necessarily need to be detailed or formal.
Overall, the subject of this question is English, specifically related to the conventions and characteristics of informal letter writing.
Learn more about Informal letter writing