The bill was sent to the company by ________.

A．the workman sent a bill to the company
B．the mice bought for the job were a male and a female
C．the workman had paid for the mice
D．mice were needed in repairing a house

A．The thirty-foot-long pipe was not a straight one.
B．There were no big bends in the solid stone.
C．Solid stone had to be put into the pipe.
D．In one place the workmen had to put big bends into some new wiring.