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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.