1. I ... ( go) there once a long time ago and( not/be)-. back since
2. Those drivers ( drive) -. for three hours when a heavy storm suddenly (break) --
3. Mike ( want) -... to sit down because he( stand)-. all day at work.
4. The motorcycle ( belong) -... to George for years before Tina ( buy) .. it last week.
5. I ( not/think) -. he (come )-..
6. At this time tomorrow , Peter( sit) -.. for the graduation examination , so now he ( feel ) . very nervous although he ( learn) . - hard for more than three years.