Choose the option that best complete the gap. At the _________ of the century, many ways of doing things were introduced.
Answer Details
The option that best completes the gap is "turn".
"At the turn of the century" is a common phrase used to refer to the time when one century is ending and a new one is beginning. In this context, it would mean that many ways of doing things were introduced as one century ended and the new one began. For example, at the turn of the 20th century (i.e., around 1900), many new technologies were being developed that would change the world, such as the automobile, the airplane, and the telephone.