When he looked up,he suddenly found himself ______by a group of teenagers,____looked at him anxiously.
#92164
A
to be surrounded;which
B
surrounded;who
C
be surrounded;who
D
having been surrounded;which
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______ by a crowd of fans, he couldn’t move a bit. 
#90621
A
Surrounding
B
Surrounded
C
To be surrounded
D
To surround
Entering the room, I found Mary ______at the desk and _____a letter.
#90753
A
seated; wrote
B
sitting, written
C
seating; writing
D
seated; writing
 ______all  the homework assigned by the school the students have to work at it till midnight
#89573
A
Completing
B
To complete
C
Having completed
D
To have completed