Firstly, Shining morning face means the children's face after washing their face at morning. And secondly, creeping like snail means the children's who can not move and unwilling to go to school. Just like snail...
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The root word is movable because it can stand on it's on as a word, while "im" can not.
The Duke is conversing with an emissary of a tally. The Duke is attempting to wed the check's little girl, so he is endeavoring to awe the emissary. In portraying the sketch of his latest duchess, he imparts more about himself than he does of his late spouse. He takes note of that the Duchess' look of "euphoria" in the work of art is not on the grounds that he was available amid the artistic creation.