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.
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I think change can make someone nervous but I learned that change is not so bad becasue everyone is kind with open arms and change can also be a good thing from the get-go
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A, Acceleration.
Definition: increase in the rate or speed of something.
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Diagnosis is the way of processing and finding out what is causing symptoms-a disease or injury in a patient based on the process. An example of a diagnosis is a doctor researching the cause of their patient's leg pain.
Hope that helps. x