There are more cars.The pollution will be worse.意思

worse不是 bad的比较级吗??
bad修饰pollution是什么意思啊??

请帮我解释一下,谢谢 ~~谢谢~~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

There are more and more people There are more people on the beach than _____ There are more than 50 proposals ___at the conference. there are far more opportunities for young people that there used to be There have there are There are more and more trees on ____ side of the trees in Shanghai.应该填either还是each？ 有这样一句话:There are twenty more trees to be planted.那么这一句呢: There are more than 1.2 billion in china.帮忙翻译,还要具体分析啊,谢谢. there are more students in class one than in class two/those in class two? 为什么是：We have planted ten tress and there are twenty more to be planted