幫我改文法同整番靚過句子,thx

1. The last wood on earth ! – The wood here is referring to a forest. If you are just talking about a tree, it should be changed to :
The last ??? tree on earth. – you cannot just say tree because there are still many trees on earth, so the tree you are talking about must be a kind of specific tree.

2. That was the saddest memory in human history with everything destroyed.