Don't worry about me. What is the use of about in this sentence?

The questions are found below. In this sentence, what part of speech is below?

It's too hot; _________, you have to stay inside. What word will best complete this sentence?

Please stay with me until the end of the world. How is until used in this sentence?

I need you in my life. What kind of action verb is need?

What action verb needs a direct object?

Whenever I am free, I see to it that I read my favorite novels. what kind of clause is this?Whenever I am free

I completely finished Mitch Albom's collections. What kind of adverb is used in this sentence?

Before I let you go, I want to say I love you. How is the word before used in this sentence?

Because of this pandemic, many people suffered. Which of the following is the compound preposition?