By the time she finally ______________ (arrive), we ______________ (wait) for over an hour in the cold.
arrived, had been waiting
By the time she finally arrived, we had been waiting for over an hour in the cold.
I ______________ (read) the report when the fire alarm ______________ (go) off unexpectedly.
was reading, went
I was reading the report when the fire alarm went off unexpectedly.
They ______________ (live) in Berlin since 2010, but they ______________ (consider) moving to Vienna next year.
have lived, are considering
They have lived in Berlin since 2010, but they are considering moving to Vienna next year.
By the end of next year, he ______________ (complete) his doctorate, which he ______________ (work on) for the past six years.
will have completed, has been working
By the end of next year, he will have completed his doctorate, which he has been working on for the past six years.
She ______________ (not anticipate) that the data ______________ (reveal) such a significant discrepancy in the results.
She had not anticipated that the data would reveal such a significant discrepancy in the results.