1.While it------(rain),I------(sleep)

1.While it______(rain),I______(sleep)
2.He______(return)home when I______(sweep)the floor
3.Just as he ______(drive)to London,his car______(break)down
4.As I ______(wait)for the bus,I______(find)a one yuan note on the ground
5.He was walking along the river______he heard a noise(when,while)
6.______he saw me,I was watering the garen(when,while)
7.The boy swimming______I was sitting in the sun(when,while)