He___ ( study) for three hours before he ___( take) a break
My sister___ (cook) dinner when I ___(arrive)
We___ (not play) because it___ (rain)
I ___ (finish) the project before the teacher___ (collect) it
While I ___ (walk) to school, it ___ (start) to rain
She___ (not go) to school because she ___(be) sick
___ you ___ (do) your homework before the class started?
They ___ (wait) for 30 minutes when the bus finally___ (come)