In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Passage: The Slaters of Wolverhampton are plagued with Mrs. Slater's chronic debilitating asthma and her cooking limited to what comes in canned goods that she can heat in boiling water. Mr. Alan Slater is sick with worry and has a cantankerous personality. Nigel longs for a life that is more than a succession of canned-food dinners made from what can be heated in boiling water. When dinner is burnt, the standard substitute of toast is always served. He loves toast, with the crunchy outside giving way to buttery softness inside. Despite her infrequent forays into cooking meals from scratch, his mother's attempts to improve her cooking change nothing before or after her death. His father continues in widowhood with the same cooking style and frequent dinners of toast. The experience brings Nigel to conclude that he is not liked. Nigel learns from a friend that the way in which he could attempt a better relationship with his father is to cook a meal for him.
His cooking efforts are thwarted by the new housekeeper, the married and "common" Mrs. Joan Potter, who seduces Alan with her apple pie and array of gourmet meals. The two start to spend time together: at one point, she exiting her council house through an upstairs window so as not to be found out by her husband. Without announcement, the Slaters move to the Herefordshire countryside along with Mrs. Potter. Nigel co-exists with her but never accepts her. She makes a competition of cooking when the teenaged Nigel's shows an emerging interest in developing his skills at school home economics class cookery lessons. Mrs. Potter's lemon meringue pie becomes Nigel's quest to learn the secret recipe. 
Question: While Nigel's mom has asthma, what makes his dad ill?
worry.

Passage: Laurel and Hardy are seated at a dockside where Stan is fishing. Ollie sees a notice in a newspaper which says one Ebeneezer Laurel has died and left a large estate. Parties interested in the estate should go to the Laurel mansion for the reading of the will. Stan can't remember if Ebeneezer is a relative or not but they decide to go to the mansion anyway. They arrive during a thunderstorm and discover that Ebeneezer had been murdered and that the police had placed the notice in the newspaper to draw all of the relatives together to find out who committed the crime.
Stan and Ollie are shown to a bedroom to sleep overnight, which is the room in which Ebeneezer was murdered. They hear a strange noise and in the darkness see a pair of eyes which turns out to be a cat. They then hear a scream and decide to investigate.
Meanwhile, the butler is calling all of the relatives to a study telling them they have a phone call. After sitting in a chair and lifting the handset of the phone, the lights go out, there is a scream and a sound like a door slamming, and the relative is never seen again. Stan and Ollie return to their bedroom and get into the bed but a bat has flown into their room and is under their covers, which causes them to panic and run downstairs.
All of the other relatives have now disappeared and the butler calls Stan and Ollie to take a telephone call in the study. Ollie sits in the chair to take the call. This time, however, the lights stay on and it is revealed that the chair is affixed to a trapdoor into which each of the other relatives vanished. Ollie falls through the trapdoor, but is saved due to his having become wedged in the chair. The murderer (a man dressed in drag) appears through a secret door with a knife. A fight ensues, but then Stan and Ollie both wake up from a dream, fighting over Stan's fishing line at the dockside and then falling into the water. 
Question: What is the last name of the person who can't remember is Ebeneezer Laurel is a relative or not?
Laurel.

Passage: Nannerl herself was an   apt pupil, no less quick to learn than her brother, and was playing the keyboard with striking virtuosity by the time she was eleven. In that year, 1762, Leopold brought the children to Munich to play before Maximilian III Joseph, Elector of Bavaria. Leopold then took the entire family to Vienna, on a trip that lasted for three months. He had secured invitations from several noble patrons, and within three days of arriving the children were playing at the palace of Count Collalto. Among those present was the Viennese Treasury councillor and future prime minister Karl von Zinzendorf, who noted in his diary that "a little boy, said to be only five-and-a-half years old [Wolfgang was actually nearly seven], played the harpsichord". After an appearance before the Imperial Vice-Chancellor, the Mozarts were invited to the royal court, where the Empress Maria Theresa tested Wolfgang's abilities by requiring him to play with the keyboard covered. During this court visit Wolfgang met the Archduchess Maria Antonia, the future Queen Marie Antoinette of France, who was two months his senior. Mozart's biographer Eric Blom recounts an anecdote of how the Archduchess helped Wolfgang when he slipped on the polished floor; she is supposed to have received a proposal of marriage in return.As the Mozarts began to be noticed by the Viennese aristocracy, they were often required to give several performances during a single day. They were well rewarded for this activity—at the end of their first hectic week in Vienna, Leopold was able to send home the equivalent of more than two years' salary. Their schedule was interrupted when Wolfgang fell ill with scarlet fever, and their former momentum was not regained. Nevertheless, the visit left Leopold eager to pursue further opportunities for social and financial success. On their return to Salzburg, Wolfgang played the harpsichord and violin at a birthday concert for the archbishop, to the evident astonishment of those present. 
Question: Who played the keyboard with striking virtuosity?

Wolfgang.