People have destroyed more than half of all the trees on the

People have destroyed more than half of all the trees on the earth in the late
1、People have destroyed more than half of all the trees on the earth in the late 200years.(改被动语态)
2、How are comic strips produced?The article will probably be about that.（合并为宾语从句）
3、You can’t go to the library now because they are cleaning it.（把划线部分改为被动语态）
今天就要,请尽快
4、We plant trees and take care of them so that we can help to protect our enviroment.(改为简单句）
We plant trees and take care of them______ ______ ________ protect our enviroment.
5、I want to buy a computer with the money.I earned it by myself.（保持原句意思）
I want to buy a computer with______ _______I earned by myself.
第3题划线在“because they are cleaning it.”