Q7
Reading
A text reads: "The scheme was abandoned after two years, largely because of its cost." Why was it stopped?
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"Largely because of its cost" gives the main reason directly. "Largely" signals the primary cause, so "mainly because it was too expensive" matches.
Q8
Vocabulary
What is the closest meaning of substantial in "a substantial increase in applications"?
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Substantial means large or considerable in amount. It says nothing about timing or surprise — a common trap in the vocabulary questions.