(2013·辽宁六校高三联考)After walking on the zigzag path to the mountain top for a few hours, the tourists gathered under trees ________ shade and ________ down to have a rest.
#89281
A
provided; sit
B
providing; sitting
C
providing; sat
D
provided; sat
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The teacher said he needed _____ boys besides his students _____ the classroom. 
#97946
A
20 other; clean  
B
20 more; to clean
C
20 more; cleaning
D
another 20; clean