_________ the floor, I found his pen lying on the ground. 
#82531
A
While sweeping
B
While swept
C
If sweeping
D
If swept
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He is taller than he ______.
#84642
A
used
B
used to be
C
used to
D
used to do
So extraordianry __________ that it left a deep impression on visitors.
#82784
A
was the Shanghai 2010 Expo
B
the Shanghai 2010 Expo was
C
did the Shanghai 2010 Expo
D
the Shanghai 2010 Expo did
If ____, the dirty air will lead you to fall ill.
#83097
A
breathe in
B
you to breathe in
C
breathing in
D
breathed in
____snacks and drinks , but they also brought cards for entertainment when they had a picnic in the forest.
#80857
A
Not only they brought
B
Not only did they bring
C
Not only brought they
D
Not only they did bring