Complete as frases com a forma correta do verbo no past continuous ou no past simple:

a) My mum was ____________ for me when I was at your house. (look)
b) They ____________ a great voice. (have)
c) I were ___________ for you at school.Where ___________ you? (wait - is)
d) He __________ the bill while I was __________ my mom. (pay - help)