The philosophy of science grapples with a foundational question that has [1] philosophers since antiquity: what distinguishes genuine scientific knowledge from mere belief or conjecture? Karl Popper's principle of falsifiability proposed that a theory could only be considered scientific if it were, in principle, [2] to empirical refutation — a criterion that famously excluded psychoanalysis and Marxist historical theory from the domain of science. Thomas Kuhn subsequently challenged this tidy picture, arguing that scientific progress does not proceed through the steady accumulation of falsified theories but rather through periodic revolutions in which an entrenched paradigm is [3] overthrown by a rival framework incommensurable with the old. This view suggested that scientific knowledge is not a straightforward march toward objective truth but is instead shaped by the sociological and psychological commitments of the scientific community. Critics of Kuhn have charged that his account risks lapsing into a relativism that [4] the very notion of scientific progress, since if paradigms are genuinely incommensurable, there is no neutral standpoint from which to judge one superior to another. Contemporary philosophers of science have largely sought a middle path, one that acknowledges the social dimensions of scientific practice [5] abandoning the conviction that science, over the long run, tracks an independent reality.

1. Blank [1]
   • A. occupied
   • B. preoccupied ✓
   • C. engaged
   • D. absorbed

   'Preoccupied philosophers' precisely captures a question that has persistently held the attention of thinkers over a long period, often to the exclusion of other matters — the enduring, consuming nature of this puzzle since antiquity. 'Occupied' is plausible but weaker, implying general engagement without the sense of persistent, almost obsessive attention. 'Engaged' typically requires the preposition 'with' and does not take a direct object transitively. 'Absorbed' is more commonly used reflexively ('philosophers have been absorbed in...') rather than transitively taking 'philosophers' as its object.

2. Blank [2]
   • A. susceptible
   • B. vulnerable
   • C. amenable ✓
   • D. open

   'Amenable to' is the precise term of art in discussions of Popperian falsifiability, meaning capable of being tested or responsive to a particular process — 'amenable to empirical refutation' is the standard phrase in philosophy-of-science literature. 'Susceptible to' and 'vulnerable to' both carry a negative connotation of being harmed, misrepresenting falsifiability as a weakness rather than the virtue Popper intended it to be. 'Open to' is plausible but far less precise than the established philosophical term 'amenable'.

3. Blank [3]
   • A. gradually
   • B. eventually
   • C. abruptly ✓
   • D. ultimately

   Kuhn's central thesis was that scientific paradigms shift not through gradual, incremental change but through sudden, discontinuous 'revolutions' — 'abruptly overthrown' precisely captures this discontinuity, the very point that distinguishes Kuhn's model from a steady, cumulative view of progress. 'Gradually' directly contradicts Kuhn's thesis. 'Eventually' and 'ultimately' describe an outcome occurring in time without specifying whether the change was sudden or gradual, missing the central distinguishing feature of a Kuhnian 'revolution'.

4. Blank [4]
   • A. undermines
   • B. erodes
   • C. dissolves
   • D. negates ✓

   The following clause describes an absolute consequence — 'there is no neutral standpoint from which to judge one superior to another' — indicating not a gradual weakening but a complete logical cancellation of the concept of progress, which requires a standard against which improvement can be judged. 'Negates' precisely captures this categorical nullification. 'Undermines' and 'erodes' both imply a gradual, partial weakening over time, inconsistent with the absolute consequence described. 'Dissolves' suggests a gradual disappearance rather than a direct logical cancellation.

5. Blank [5]
   • A. without ✓
   • B. while
   • C. despite
   • D. yet

   'Without abandoning' is the correct construction for an action performed while deliberately excluding another — the sentence describes a middle path that accepts one claim (social dimensions of science) while explicitly not accepting a second, seemingly opposed one (abandoning belief in objective reality). 'While abandoning' would mean the two happen simultaneously — the opposite of the intended 'middle path' meaning. 'Despite abandoning' would require the abandonment to have already happened. 'Yet abandoning' is grammatically awkward and non-idiomatic in this construction.