The concept of sustainable development emerged [1] the 1987 Brundtland Report, which defined it as development that meets the needs of the present [2] compromising the ability of future generations to meet their own. In the decades since, this principle has [3] significant institutional momentum, [4] in the adoption of the United Nations Sustainable Development Goals in 2015. The transition [5] a green economy requires not merely the adoption of renewable technologies but a fundamental reconfiguration of production, consumption, and governance systems. Critics argue that corporate sustainability commitments often amount to cosmetic adjustments rather than structural reform — a tendency pejoratively termed 'greenwashing'. Genuine sustainability demands that environmental costs be factored into economic pricing so that markets reflect the true cost of resource use. Governments must therefore implement carbon pricing mechanisms and phase out fossil fuel subsidies. As long as such reforms continue to be resisted by entrenched interests, the gap between rhetorical commitment and operational reality will persist.

1. Blank [1]
   • A. after
   • B. in
   • C. from ✓
   • D. with

   'The concept of sustainable development emerged ___1___ the 1987 Brundtland Report' tests the correct preposition for 'emerge'. When a concept or idea originates from a source document or event, the correct preposition is 'from' — 'emerged from' is the standard phrasal verb for origin. 'Emerged after' would mean it appeared following the report chronologically but not necessarily from it. 'Emerged in' would mean it came into existence within the report. 'Emerged with' implies simultaneous appearance. 'Emerged from the Report' correctly identifies the Report as the source.

2. Blank [2]
   • A. without ✓
   • B. while
   • C. yet
   • D. despite

   'meets the needs of the present ___2___ compromising the ability of future generations' — this is the famous definition of sustainable development and tests the conjunction that introduces a negative condition following a positive action. 'Without' followed by a gerund ('without compromising') is the only grammatically correct construction for expressing that an action is performed while excluding another action. 'While compromising' would mean the two happen simultaneously. 'Yet compromising' is grammatically awkward. 'Despite compromising' reverses the intended meaning.

3. Blank [3]
   • A. accumulated
   • B. built
   • C. gained
   • D. gathered ✓

   'this principle has ___3___ significant institutional momentum' — the blank tests the fixed collocation with 'momentum'. 'Gather momentum' is the established idiom meaning to gradually build speed, support, or force. It is the standard phrase in political and policy writing for an idea that progressively gains institutional backing. 'Build momentum' is also used but 'has gathered' is the more natural present-perfect form for describing accumulated progress. 'Accumulated momentum' and 'gained momentum' are less idiomatic — 'gather' is the conventional verb in this collocation.

4. Blank [4]
   • A. resulting
   • B. culminating ✓
   • C. ending
   • D. leading

   The phrase '___4___ in the adoption of the United Nations SDGs in 2015' follows a description of a process that built momentum over decades. 'Culminating in' is the fixed phrasal verb meaning to reach the highest or final point in a series of events — it conveys that the adoption of the SDGs was the peak achievement of this building momentum. 'Resulting in' is possible but is more neutral and does not convey the sense of a climactic endpoint. 'Ending in' implies termination. 'Leading in' is grammatically incorrect in this context.

5. Blank [5]
   • A. to
   • B. into
   • C. for
   • D. toward ✓

   'The transition ___5___ a green economy' — the blank tests the preposition that follows 'transition'. In formal policy writing, 'transition toward/to' a new system is the standard phrasing. 'Toward' is preferred because it conveys ongoing movement and direction without implying completion — the green economy is a goal being moved toward, not one already reached. 'Transition to' is also widely used. 'Transition into' implies transformation of one thing into another rather than movement toward a goal. 'Transition for' is grammatically incorrect.