Complete the sentence: Leibniz wheel calculators were popular in the ___ that followed, but these ingenious devices were eventually replaced by .

Here are the answers to your questions:

Q[1]:
The sentence requires a word to complete the phrase "first half of the twentieth" and a conjunction to connect the two independent clauses. The second clause ("these ingenious devices were eventually replaced...") presents a contrast to the first ("Leibniz wheel calculators were popular..."). A comma followed by "but" correctly connects two contrasting independent clauses.
The correct option is:
C) century, but

Q[2]:
The sentence lists the author's works, using semicolons to separate complex items that contain internal commas. The blank needs to insert another work, "Lagos, A Kind of Marriage," into this list. To maintain parallel structure, the title should be followed by a semicolon to separate it from