He used riddling to talk to Smaug I think because he wanted to stall and waste time as he figured out a plan. He also used riddles to talk to Golem who he clearly was trying to stall to save himself as Golem wanted to kill and eat Bilbo. So it is a reoccurring theme of Bilbo and it makes sense.
The audience shapes your writing because you must alter vocabulary and tone when targeting your work at a particular demographic. For example, children's books have less sophisticated language accompanied by sophomoric humor so that they can understand the vocabulary and remained entertained while academic journals will likely be written in a scientific, sterile way with more educated words as to target the other students, researchers, and professors reading their work. In the same way, if you are writing an essay to be graded or reviewed by an authority figure, you would use more advanced language to sound professional and intelligent.
<span>Tinsel. Tinsel is comprised of small bits of either foil or a foil-like material and are often put on Christmas trees as a substitute for frost or ice. The benefit of this is that the tinsel can be used indoors where it will neither melt nor require cold temperatures to maintain its condition.</span>
