Past perfect continuous interrogative-negative 3 - tutto inglese - Imparare l'inglese gratis on line

the musicians (practice) together before the tour?
we (clean) the house regularly before the guests arrived?
he (study) diligently before the exams?
the students (participate) in the club before it won the award?
she (work) on that project before it was canceled?
they (try) to reach a compromise before the meeting?
I (look) for a solution before the problem escalated?
he (follow) the diet before he saw results?
we (invest) time into the relationship before it improved?
she (contribute) to the team before her recognition?