21.
(A) marred
(B) spanned
(C) mopped
(D) shunned
(E) mugged

17. Contrary to popular belief, the light bulb, a mainstay of modern life, had been around years before Thomas Edison ever created one. _____ Previous versions were unreliable, expensive, and didn’t last very long. Up to 20 other independent inventors were doing the same thing as Edison at the time, trying to build a better light bulb. Edison’s version of the light bulb improved on the filament, used a sealed vacuum bulb, and had a lower voltage than others at the time. The result was a marketable product that could last for hours. (A) Edison’s contribution was nothing but to improve on it. (B) Thomas Edison was credited with the formulation of the light bulb. (C) Edison purchased patents for the light bulbs other people had developed. (D) Edison’s design has been improved upon over the years.

18. Drones have become an increasing nuisance for airports worldwide in recent months, and good solutions to keeping them from interfering with flights aren’t yet available. Airports in various cities have grounded planes in the last three months following drone sightings. The incident at Gatwick in December proved especially disruptive, _____. Aviation experts fear catastrophic damage or death could result from a drone hitting an airplane. Such an incident could be accidental or motivated by ill will, such as a terrorist attack. (A) impacting the flights of more than 100,000 passengers (B) losing millions of dollars from flight delays and cancellations (C) causing more damage than birds—a threat the industry has long faced (D) concerning the lack of fully vetted drone detection and counterdrone systems

19. Please rearrange the following sentences into a coherent paragraph. (1) Air is forced upwards where it passes through a photo-catalyst filter to sterilize bacteria and viruses, before being released into the atmosphere. (2) As well as providing clean air, the repository of carbon particles captured could go on to find use in graphene, concrete, fertilizer, ink and water distillation. (3) Each is capable of producing more than 353 million cubic feet of clean air per day, serving an area of 100 hectares. (4) Inflows at the base of a tower suck in air and pass it through five stages of filtration--including charcoal-activated carbon, negative ion generators and electrostatically-charged plasma--to trap airborne particles. (5) The Smog Project comprises a vast array of 328 feet-high air filtration pods. (A) 43125 (B) 42531 (C) 54123 (D) 53412

20. Please rearrange the following sentences into a coherent paragraph. (1) As the grim implications of contract cheating on campuses worldwide increase, it is essential for students and educators alike to understand what they can do to combat them. (2) At high schools and universities worldwide, students can log onto a variety of essay mill sites, offer exact details on the nuances of their assignment and the due date. (3) Sometimes known as ghostwriting, contract cheating is when individuals engage a third-party or service to complete their assignment or exam. (4) Students and educators around the world know that contract cheating is a growing reality on our modern campuses. (5) Then they may receive a guarantee that the paper will arrive on time once payment is confirmed. (A) 14325 (B) 34125 (C) 43251 (D) 25341

22. (A) criterion (B) elimination (C) patent (D) betrayal (E) gesture

23. (A) all for (B) far from (C) in with (D) on and on (E) down to

24. (A) Meanwhile (B) Consequently (C) Moreover (D) Still (E) Otherwise

25. (A) by (B) at (C) to (D) with (E) as

26 (A) lifts (B) sanction (C) happen (D) compatible (E) nightmare (AB) nascent (AC) guises (AD) defray (AE) caveats (BC) lenient (BD) edifice (BE) affordable (CD) illimitable (CE) pardon (DE) dispense (AB) nascent (AC) guises (AD) defray (AE) caveats (BC) lenient (BD) edifice (BE) affordable (CD) illimitable (CE) pardon (DE) dispense

27 (A) lifts (B) sanction (C) happen (D) compatible (E) nightmare (AB) nascent (AC) guises (AD) defray (AE) caveats (BC) lenient (BD) edifice (BE) affordable (CD) illimitable (CE) pardon (DE) dispense (AB) nascent (AC) guises (AD) defray (AE) caveats (BC) lenient (BD) edifice (BE) affordable (CD) illimitable (CE) pardon (DE) dispense