你好~
(1)If we reuse something again,it will not end up as waste. reuse“再利用”与again重复(去掉"reuse"或者把"reuse"改成use")
(2) What do you suggest would do?(把"would"改成"to")
(3)Everyone should study from past mistakes to avoid future ones.(student 改成learn) learn from…从…中吸取教训.
希望能帮到你~