Choose the correct options

1. As soon as I
   [understand|understood|understands]
   what happened, I called her to apologise.
2. My mother
   [were|was|been]
   born in Lviv.
3. His friend
   [used to play|plays|played]
   volleyball, but now he plays basketball.
4. How long
   [did it take|did it took|it took]
   you to get to the university?
5. I didn't understand them because they
   [speak|spoke|spoken]
   very fast.
6. I didn't know who I
   [saw|seen|see]
   in the library. I thought that was you.
7. He didn't
   [studied|study|used to study]
   German last year.
8. I
   [didn't see|haven't seen|don't see]
   him working yesterday.