Put the verbs in brackets in the correct form (past simple or past continuous tense). 1.when i came home my mom for us. (to cook) 2."what ? " (to talk) — "nothing serious." 3.i'm sorry i couldn't join you yesterday. i my exam, (to prepare) 4. you a minute ago? (to laugh) — it was the funniest joke i've ever heard. 5.the spaceship captain satellite which fast, (to notice / to move) it was dangerous!

1.When I came home my mom was cooking dinner for us.
2."What were you talking about?" — "Nothing serious." 
3.I'm sorry I couldn't join you yesterday. I was preparing for my exam, 
4.What were you  laughing at a minute ago? — It was the funniest joke I've ever heard. 
5.The spaceship captain noticed the satellite which was moving very fast. It was dangerous!