Помогите ПЖ с английским!! Номер 83. ЗАРАНЕЕ ОГРОМНОЕ СПАСИБО!!!

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In my opinion, space exploration is very interesting occupation because maybe one day we will find another planet where to live on. I believe it changes people's life for the better and makes progress. But sometimes it seems to me that it is just a waist of time and money because there are lots of serious problems on Earth and firstly we have to do something with our planet.