单项选择题

Numerous studies already link the first meal of the day to better classroom ______.

A. performance
B. function
C. behavior
D. display
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单项选择题
Mr. Smith asked his secretary to ______ a new paragraph in the annual report she was typing.
A. inject
B. install
C. invade
D. insert
单项选择题
Although they lost their jobs, savings and unemployment benefits allow the couple to ______their comfortable home.
A. come in for
B. catch up with
C. look forward to
D. hold on to
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