This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Tower Control controls aircraft on the runway and in the controlled airspace immediately surrounding the airport. Tower controllers may use radar to locate an aircraft's position in three-dimensional space, or they may rely on pilot position reports and visual observation. They coordinate the sequencing of aircraft in the traffic pattern and direct aircraft on how to safely join and leave the circuit. Aircraft which are only passing through the airspace must also contact Tower Control in order to be sure that they remain clear of other traffic.
Who controls aircraft on the runway?

The interface of Windows 8 has been the subject of mixed reaction. Bright wrote that its system of hot corners and edge swiping "wasn't very obvious" due to the lack of instructions provided by the operating system on the functions accessed through the user interface, even by the video tutorial added on the RTM release (which only instructed users to point at corners of the screen or swipe from its sides). Despite this "stumbling block", Bright said that Windows 8's interface worked well in some places, but began to feel incoherent when switching between the "Metro" and desktop environments, sometimes through inconsistent means. Tom Warren of The Verge wrote that the new interface was "as stunning as it is surprising", contributing to an "incredibly personal" experience once it is customized by the user, but had a steep learning curve, and was awkward to use with a keyboard and mouse. He noted that while forcing all users to use the new touch-oriented interface was a risky move for Microsoft as a whole, it was necessary in order to push development of apps for the Windows Store. Others, such as Adrian Kingsley-Hughes from ZDNet, considered the interface to be "clumsy and impractical" due to its inconsistent design (going as far as considering it "two operating systems unceremoniously bolted together"), and concluded that "Windows 8 wasn't born out of a need or demand; it was born out of a desire on Microsoft's part to exert its will on the PC industry and decide to shape it in a direction—touch and tablets -- that allows it to compete against, and remain relevant in the face of Apple's iPad."
What makes the Windows 8 interface difficult to use?

Carnival in Haiti started in 1804 in the capital Port-au-Prince after the declaration of independence. The Port-au-Prince Carnival is one of the largest in North America. It is known as Kanaval in the Creole language. It starts in January, known as "Pre-Kanaval", while the main carnival activities begin in February. In July 2012, Haiti had another carnival called Kanaval de Fleur. Beautiful costumes, floats, Rara parades, masks, foods, and popular rasin music (like Boukman Eksperyans, Foula Vodoule, Tokay, Boukan Ginen, Eritaj, etc.) and kompa bands (such as T-Vice, Djakout No. 1, Sweet Micky, Kreyòl La, D.P. Express, Mizik Mizik, Ram, T-Micky, Carimi, Djakout Mizik, and Scorpio Fever) play for dancers in the streets of the plaza of Champ-de-Mars. An annual song competition takes place.

What year did the Carnival start in Haiti?