三道英语同义句转换
1.Factories must now clean their water before it is thrown away.
Factories must（ ）throw their water away（ ）they clean it.
2.This street is no better than that one.
This street is almost（ ）（ ）（ ）that one.
3.It’s difficult to climb up the Great Wall.
（ ）（ ）up the Great Wall （ ）difficult.