What wilI our life be like by the year 2100? It's difficult for us{#blank#}1{#/blank#}(imagine)．People  {#blank#}2{#/blank#}(live)on the earth for so many years．It is becoming more and more crowded and polluted．Maybe people will live on the other planet--Mars．Astronauts {#blank#}3{#/blank#}(not be)to Mars yet so far．Let's imagine what our life will be like on Mars．I think life on Mars will be better than{#blank#}4{#/blank#}(those)on the earth in many ways．People will have more space．Robots will do most of work．so people will have more time for{#blank#}5{#/blank#}(hobby)．What's more，there will be no school on Mars．Every student will have a computer at home．They can study，do their homework and take exams online．

— Perhaps they are twins'.