1) Frequently their renovation need to be completely redone.

1 need
2 needed
3 were needing
4 will have been needing
5 needs

2)If we were teenagers at the time these licenses signified our passage to adulthood.
1 time these licenses
2 time, these licenses
3 time; these licenses
4 time. These licenses

3)Whether or not we have chosen to use our licenses since then. They remained of enormous value to us.
1 since then. They remain
2 since then, they remain
3 since then they remain
4 since then; they remain

I'll be glad to check your answers.

i think

1 is 2
2 is 2
3 is 2
are they correct?

Yes, they are all correct.

Thank you so much ^_^

You're very welcome.

needed (100% sure)

since then, they remain (100%)

1) The correct answer is option 2) needed. This is because the sentence is referring to past renovations that were completely redone. In this case, the past tense form of "need" is "needed."

2) The correct answer is option 4) time. These licenses. This is because the sentence is stating that if we were teenagers at the specified time, these licenses signified our passage to adulthood. The comma is used to separate the dependent clause ("If we were teenagers at the time") from the independent clause ("these licenses signified our passage to adulthood").

3) The correct answer is option 1) since then. They remain. This is because the sentence is using the present tense to indicate that, regardless of whether or not we have chosen to use our licenses since then, they still remain of enormous value to us. The period is used to separate the two independent clauses.