Ответ:
1) She had_been_ preparing for the next day _for_ a long time.
2) She _was_ feeling the pressure.
3) She turned over and remembered how she _had_ learned to swim.
4) They _would_ go to the local pool every day after school and her father _used_ to show her what to do.
5) She soon _got_ used to it.
6) She had _become_ their youngest member.
She quickly got used to scoring goals and _feeling_ under plessure.
7) I _never_ used to have problems going to sleep.
8) I didn't _use_ to be the captain of the team.