1.took
2.didn't eat; didn't fee
3.have just returned; Did you go; have you stayed;
6.Did you see
7.Have you seen
We weren”t thinking about recycling
They weren’t singing at the concert
I was not paying attention
why weren’t they watching the movie
Who was clapping at the end
1. Seldom freezes (seldom=rarely (редко) указывает на повторяемость действия, поэтому Present Simple)
2. Doesn't exist (это высказывание - всеобщая истина (воды на луне нет), поэтому опять же Present Simple)
Ex. 1
1. How much did you pay for that painting?
2. I did not pay anything. It was a present.
3. When we arrived at the cinema, our friends were waiting for us.
4. My grandfather found a valuable manuscript while he was working in his attic.
5. He sold it to the museum for more than half a million a dollars.
Ex. 2
1. What kind of music did you use to listen when you were a child?
2. I used to listen to pop music. I did not use to like classical music then, but I do now.