Conjunctive Adverb

What is the purpose of a conjunctive adverb?

What is the conjunctive adverb in the following sentence:

We wanted to drive to the festival; however, it rained so we stayed home.

Where should you put the semi-colon (;) in the following sentence:

We wanted to go to the festival however it snowed so we stayed home.

What is the conjunctive adverb in the following sentence:

He felt he couldn’t tell the truth about what happened; instead, he lied.

Where should you put the semi-colon (;) in the following sentence:

He felt he couldn’t tell the truth about what happened instead, he lied.

What is the conjunctive adverb in the following sentence:

You need to put more effort into your work; otherwise, you won’t get a passing grade.

Where should you put the semi-colon (;) in the following sentence:

You need to put more effort into your work otherwise, you won’t get a passing grade.

What is the conjunctive adverb in the following sentence:

Gas prices are getting high; on the other hand, I really enjoy driving such a nice vehicle.

Where should you put the semi-colon (;) in the following sentence:

Gas prices are getting high on the other hand, I really enjoy driving such a nice vehicle.

What is the conjunctive adverb in the following sentence:

I really want to give out no homework next week; nevertheless, we need to show we learned something.

Where should you put the semi-colon (;) in the following sentence:

I really want to give out no homework next week nevertheless we need to show we learned something.