A parallel sentence mentions the same grammatical expression twice. I would go with "D". 'Passed' and 'Demonstrated' are both past tense words that express the same past tense grammatical idea.
If you have more questions, feel free to ask me.
Answer to Question 18:
I believe the answer is B: he never ate vegetables, but now he loves them.
Answer to Question 19:
I believe the answer is B: beautiful while also being unique.
Explanation to Question 18:
The <em>ate </em>in the sentence clarifies that he used to never eat vegetables, but now he does.
Explanation to Question 19:
<em>Unique </em>in the sentence is clarifying that the uniqueness of the home's furniture is positive, so it's not beautiful or unique; the furniture is beautiful and unique at the same time.
When Ivan developed an illness, his character developed from being self-centered to being compassionate. By facing his own death, he began to examine his life. Gerasim, the one who helps Ivan during his sickness, was also a factor to his character development.
Answer:
The answer is A. First, coat the cake pans with butter and flour.