. _______ different kinds of pianos, the workers farther improved their quality.
#97438
A
To produce 
B
Being produced 
C
Produced
D
Having produced
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The lecture mainly deals with the trouble young children have _______ right from wrong.
#91248
A
distinguished
B
distinguishing
C
to distinguish
D
to be distinguished
You can hardly imagine the difficulty the woman had _____ her children.
#97318
A
brought up
B
to bring up
C
bringing up
D
to have brought up
—The last one _____ pays the meal.—Agreed!
#90291
A
arrived
B
arrives
C
to arrive
D
arriving