Question

Поставьте глаголы в скобках в правильную форму 1. When I came home my mom... dinner for us.(to cook) 2.What ...you ... about?(to talk)-Nothing seriours. 3 I'm sorry I couldn't join you yesterday. I ...for my exam. (to prepare) 4.
What... you ...at a minute ago? (to laugh) — It was the funniest joke I've ever heard. 5.The spaceship captain ...the satellite which ...very fast, (to notice / to move) It was dangerous!

Answer 1

I was preparing for my exam (Past Continuous).
What were you laughing at (Past Continuous) a minute ago?
The spaceship captain didn't notice (Past Simple) the satellite which was moving  (Past Continuous) very fast. 

Answer 2

When I came home, my mom was cooking dinner for us.
What are you talking about? — Nothing serious.
What did you say at a minute ago? — It was the funniest joke I've ever heard.
The spaceship captain noticed the satellit which was moving very fast. It was dangerous!