буду очень благодарен. keep off | keep away | keep on | keep up with

1) Don`t stay too close to the cage with animals in zoo. Be careful and .
2) I will always try to from unkind people and to be a good one.
3) Parents always try to their children from danger.
4) Sometimes it is really hard to new trends.
5) I see that you don`t do it well for now, but I think that you should trying to do it better.