1.how many doors yesterday? a) had painted b) were painted c)are painted 2.his new book in every book shop in town. a)is sold b) sold c)were sold 3. his umbrella a lot of money. a) is cost b)have cost c)costs 4.

1. were painted, т.к. множ. число и время, о чем нам говорит сигнальное слово yesterday
2. is sold, т.к. единств. число и по контексту ясно, что речь идет о настоящем времени. 
3. costs