Answer: B) Were his marks.
Explanation for this question is being written.
Answer: A) So
Answer: A) So strict was the boss.
Answer: A) Auxiliary (no action).
Answer: C) So is her sister.
Answer: C) Verb and subject pronoun.
Answer: C) So did their children.
Answer: D) So does my sister.
Answer: A) So have I.
Answer: B) Nowhere have I ever encountered.
Answer: B) Was last season.
Answer: D) Did I know.
Answer: A) Not since 1984 has anyone won so many matches.
Answer: B) So do I.
Answer: D) So do I.