Прошу помогите,с этим заданием туговато!! 
Put the verbs in brakcets in the correct from(past simpl or past continuous  tense)(задание)
1.When I came home my mom ... diner for us.(to cook)
2."What ... you ... about?"(to talk)-"Nothing serious."
3.I am sorry I could not join you yesterday.I ... for my exam.(to prepare)
4.Whot ... you ... at a minute ago?-It was the funniest ioke I've ever heard.
5.The spaceship  captain ... the satellit which ... very fast.(to notice/to move) It was dangerious!