Answer:
where are the vocabulary?
Estan Caminando isn't the answer as because "estan" implies to be another person, but this isn't the case as it's only the man, the man isn't walking (caminando either)
He isn't shopping (comprando) and he isn't painting (pintando)
The only logical answer is he's cooking (cocinando) which is also heavily implied as him having the bowl and whisk
B.) Esta Cocinando is your answer
1-) Ayer el conductor (tuvo) un accidente
2-) Mientras yo (cocinaba), tú limpiabas la cocina.
3-) Cuando paseaba al perro, (empezó) a llover
4-) De niña, Juanita siempre (terminaba) su tarea temprano
5-) Está mañana, las señoras (compraban) frutas en oferta
Hope this helps :)