Grammar - Active and Passive

Hey!
I am learning English and I have some problems with the following:

INSERT THE CORRECT TENSES!
Q: I have to check if anything happen yet. (Is there ED missing ? happened)
A: I have to check if anything has happened yet.
Q: This shop (not open) on Saturdays.
A: This shop is not open on Saturdays.
Q: As soon as I (give) him money, I?ll get a new car. A: As soon as I give him money, I?ll get a new car. A: As soon as I have given him money, I?ll get a new car. (I think both answers are correct)
Q: Sheila admitted that she (never do) that work before. A: Sheila admitted that she HAD never done that work before. (I saw one solution: "HAS never done", but I think it was wrong)
PUT INTO THE PASSIVE AND ACTIVE VOICE
A: Somebody had cleaned my shoes and brushed my suit. P: My shoes had been cleaned and my suit had been brushed. OR P: My shoes had been cleaned and my suit was brushed.

A: Why didn?t they mend the roof before it fell in? P: Why the roof wasn?t mended before it fell in?
A: No one can do anything unless someone gives us more information. P: Anything can be done unless we are given more information. P: Nothing can be done unless we are given more information. (I think this one is correct)
A: The judge gave him two weeks in which to pay the fine. P: He was given two weeks in which the fine is to be paid. (???)

(Please check if my answers are correct)
I would appreciate if you could correct the wrong ones.

Thanks,
Damjan