Question

Commonplace acts and utterance of the child are praised and quoted.change the voice

Answer 1

It would remain same there is no change in sentence

Answer 2

This is a subject-implied case. This sentence's voice is already passive. So we need to convert it into active. We will have to supply the subject from our side. The correct active voice sentence will be as follows:

The parents praise and quote commonplace acts and utterance of the child.

                                                             Or
The parents quote and praise commonplace acts and utterance of the child.