Where in the "fall of the house of usher" does Edgar Allan Poe use suspense to create fear?

Which three sentences in this excerpt from arthur conan doyle's "the contest" suggest that the author's tone is mocking?

Does anyone know the answers to these two? i don’t want to have to guess, you!

Boss: oh no! that’s the phone again! secretary: blank boss: . a. shall i take it? b. will you answer it? c. can you do me a favor? d. may i hang it up?