Question

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 ...quite a lot of money.
a) is cost b)have cost c)costs
4.

Answer 1

1. were painted, т.к. множ. число и прошедшее 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