Nelson's hobby is tinkering with small appliances.
"tinkering with" implies that nelson is unskilled at his hobby. you want to change the flavor of this sentence to show that nelson is, in fact, quite skilled at his hobby. which of the following should you choose to replace tinkering with so that the reader gets the right idea?
a. repairing
b. fiddling with
c. messing with
d. selling

A. Repairing

Explanation:

“Fiddle with” has a similar meaning to “tinker with”: it means to touch something restlessly or nervously, often with the purpose of making improvements; “Messing with” means to meddle or interfere with something, so it does not either express that Nelson is skilled at his hobby, and neither does “Selling,” which comes from the verb “to sell.”

“Repairing,” on the other hand, means to restore something damaged or worn to a good condition, and it is the only word that can change the flavor of the sentence to show that Nelson is quite skilled with small appliances.

a static shape has a fixed relationship between all of its vertexes. a dynamic shape can vary the position of at least one of its vertexes in relation to the others.