Составить из этих слов предложение: 1) to people have Moon travelled the 2) walked Mars on people have 3) the has changed

1) People have travelled (Present Perfect) to the Moon. 2) People have walked (Present Perfect) on Mars.  3) The climate has changed (Present Perfect). 4) We have protected (Present Perfect) the environment. 5) Pollution has destroyed (Present Perfect) a lot of trees. 6) The world has stayed (Present Perfect) the same.