Раскрыть скобки по:
Past simple и past continuous

Ответ:

1) was riding, fell. 2)crashed, was driving. 3) fell, was riding. 4)hurt, was riding. 5) was breakdancing, hit. 6) tripped, was walking. 7) was eating, fell. 8) was sending, spilled. 9) was running, tripped. 10) was, was playing football. 11) was playing, hit. 12) made, were spelling.