Question

1. a) no change b) prior to that c) as a result d) however
2. impossible; and a) no change b) impossible, and c) impossible and d) impossible: and
3. pacifist a) no change b) purist c) revolutionist d) conformist
4. self respecting a) no change b) self - respecting c) self - respected d) self respected

Explanation:

1. For the first question, "however" (D) is the correct choice as it indicates a contrast in the context of the text.
2. In the second question, a comma should be used before "and" for proper punctuation in a non - independent clause connection, so "impossible, and" (B) is right.
3. "Purist" (B) makes more sense than "pacifist" in the given context as it relates to a more general idea of strictness rather than the anti - war meaning of "pacifist".
4. The correct form is "self - respecting" (B) as it is a compound adjective modifying a noun.

Answer:

1. D. however
2. B. impossible, and
3. B. purist
4. B. self - respecting