Set 15: Boundaries (Intermediate)
Explanation
PASSAGE
Physics _______ one of the most challenging subjects for many students.
Which choice completes the text so that it conforms to the conventions of Standard English?
Detailed Answer Explanation
This question tests your understanding of sentence boundaries and punctuation. 'Physics' is a subject name that takes a singular verb, despite ending in 's.' Use 'is.' To determine the correct answer, examine where complete thoughts begin and end. Look for independent clauses that need proper separation. A period, semicolon, or appropriate conjunction can correctly join or separate these ideas. When analyzing sentence boundaries, pay attention to how ideas flow from one sentence to the next. Correct punctuation ensures clarity and prevents confusion for readers. Review the options carefully to identify which choice creates proper sentence structure.
Key Evidence:
• "physics (singular subject name)"
Why others are wrong: D ('Have been' is plural.), C ('Were' is plural.), B ('Are' is plural; 'physics' as a subject takes singular.).
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