The best way to eliminate wordiness is the following:
<em> The audience gave the guest speaker a standing ovation.</em>
Wordiness is the use of more words than necessary to express an idea. The phrase <em>"to give a standing ovation"</em> already comprises the ideas of "rose up" and <em>"applauded"</em>. Thus, they are not necessary in the sentence. Replacing those words with the words <em>"gave the guest speaker a standing ovation"</em> is the right way to eliminate wordiness in that sentence.
It is "over the mantelpiece." This is because "over" is a preposition that is telling you where the painting is hanging.
Last nights dinner caused me great satisfaction.
its A:house's
if it were to be more than one house that own it it would be houses' or like bosses' and boss's