it is appropriate to break the rule that requires subjects joined by and to use a plural verb when either and neither are subjects. They always take singular verb.
For example :
Either of us is capable of doing the job
Answer:
1. B, 2. A, 3. D, 4. A, 5. C, 6. C, 7. A, 8. B, 9. D, 10. B, Challenge: C
Explanation:
check the word definitions
I think that Macduff fled because he saw the murdered of King Duncan inside the bedchambers of Macbeth. He left his castle and went to England. Macduff went to see Malcolm and had offered his support in overthrowing Macbeth from the throne. Macduff did this out of revenge after Macbeth had also murdered his family.
What price of literature are you referring to?