孩子们独自一人在河里游泳是很危险的.It ____________that children_________________________.=It ____________________for children_____________________.
问题描述：
孩子们独自一人在河里游泳是很危险的.
It ____________that children_________________________.
=It ____________________for children_____________________.
答
is dangerous swim alone in the river
is dangerous/not safe to swim alone in the river
答
It is a danger that children swim alone in the river.
It is dangerous for children to swim alone in the river.