单项选择题

"Let's _________ Maria and Helen this evening." Tom suggested.

A．call in
B．drop in at
C．stop on
D．look in on
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单项选择题
Modern medical advances _________ the average life expectancy by several years.
A．expanded
B．spread
C．extended
D．enlarged
单项选择题
_________ equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.
A．Provided
B．Concerning
C．Given
D．Following
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