Past perfect continuous interrogative 8 - tutto inglese - Imparare l'inglese gratis on line

the teacher (explain) the lesson clearly before the test?
they (use) the old software before the upgrade was available?
she (try) new recipes before the cooking class?
he (run) daily before he joined the marathon?
we (manage) the project efficiently before the delays?
the scientists (research) this area before the discovery?
she (play) the piano before the concert?
I (invest) wisely before the financial review?
he (fix) the roof before the leak got worse?
we (improve) our skills before the workshop?