this,river.is.

this,river.is. This river is ____that one. this river is the longest This is a long river. This river is long as that river.This river is the same ____ This river is about six_________long.(hundreds kilometers) this is _____the river was polluted This house is （ ） near the river is this river in which I can swim能不能换成is this river which I This river is long, but that river is longer.(改为同义句） This river is long. That river is longer.(将两个句子连成一句） The water in this river is _____ (danger) for us.