A:one
B:those
C:that
D:the one
Remember that everyone can do something to make a ____ (different) to our nature.
①城市和人口集中,是国内最大的消费地
②环境无污染
③多优良港湾
④多优良港湾原料、燃料主要依靠进口,产品主要出口
— Mr. Li will check our homework this afternoon. _______ you _______ it?
— Not yet. I'm doing it right now.