单项选择题

Due to ______ research which had taken years to complete, the scientist proudly presented her findings at the national convention.

A．intensive
B．complex
C．alternative
D．extensive
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单项选择题
During the cold and wet winter months, most cities will ______ some shelter and food for the homeless so they need not sleep out in the open.
A．substitute
B．provide
C．supply
D．forward
单项选择题
The teenagers from North High were ______ of classmates at South High because South won to host the popular new band with complimentary tickets.
A．indifferent
B．envious
C．cautious
D．furious
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