<span>A proper introduction in a letter depends on the purpose of the letter as well as on the recipient.</span>
<span>2) I asked myself quietly, "How hard can exercising be?"</span>
Answer:
The importance of clothes is a massive one. It has the essential need to keep us safe in any environment(given the type of clothing). Clothing can also help us to express ourselves and spread messages, or even raise awareness.
The answer is 3. You never use slang in academic writing, so it's not 4, imprecise vocabulary is also unacceptable in academic writing so it can't be 2, and one usually tries to avoid personal statements in academic writing, because they are mostly factual pieces.