How does W.W. Jacobs build suspense when the Whites are waiting to see if their second wish will come true? Give some examples.

The night is cold as he and his wife wait. The candle flickers and goes out; they return to their bed where they lie there silently. The clock ticks. Mr. White feels relieved but becomes distressed by the darkness in his room. He lights a match to return downstairs for a candle. At the foot of the stairs the match goes out and a knock sounds at the door.