Answer:
1. hable
2.pase
3.estudiaste
4.contestaste
5.paso
6.estudiaste
7.estudiaste
8. estudiaste
9.baile
10.cante
11. visite
12.pase
13.estudie
14.trabaje
15.estudian
16.pasan
17- 18: i think it should be: Ellos pasan trabajando. (but in your image it doesnt make sense so ill skip it.)
(there was not # 19)
20.pasastes
Hope it help : )