Read and write only the correct forms of the verbs. Use the past perfect or the past perfect continuous. Use full verb forms.

1.  When I got to the garage, the mechanic (not/repair) my car.

had not repaired

2.  They (study) this document for 2 hours before the meeting started.

had been studying

3.  They (watch) a carnival for 2 hours before the mobile phone rang.

had been watching