During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates _______ beside to see what would happen. 
#91602
A
were standing
B
stood
C
standing
D
to stand
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With dinner _____, the lady went on ____ some sewing.
#90973
A
to prepare; to do
B
preparing; doing
C
prepared; to do
D
to be prepared; doing
__________ , some students tend to develop a range of unhealthy habits .
#91470
A
Parents don’t watch over them
B
Not having watched over
C
With no parents to watch over them
D
Parents watched over