B:Then where have you been? (Present Perfect)
A:Oh, nowhere. I wanted (Past simple) to go to America two years ago,but now i don't want to go there.
B:Why?
A:I understood (Past simple) that my wish is impossible, so i abandoned(Past simple) that idea.
И 2-я
B:Have you heard some interesting news?(Present Perfect)
A:No.
B:I heard (Past simple) that Brian flunked (Past simple) his exam last week.
A:Why did (Past simple)he flunk the exam?
B:He lost (Past simple)his homework, so he didn't repeat a topic.(Past simple)
)if all the people decide to save our world, it will be better to live on Earth, because it will be clean