lt is too dangerous for the young children to play near the river by (they).给所给词的适当形式填空fast food (it)isn't always bad for you,but too much of it is not good.

lt is too dangerous for the young children to play near the river by (they).
给所给词的适当形式填空
fast food (it)isn't always bad for you,but too much of it is not good.