He found it increasingly difficult to read，________ his eyesight was beginning to fail.
A．though B．for C．but D．so
John plays basketball well，________ his favorite is badminton.
A．so B．or C．yet D．for
In some places women are expected to earn money ________ men work at home and raise their children.
A．but B．while C．because D．though
They wanted to charge $5,000 for the car, ________we managed to bring the price down.
A．but B．so C．when D．since
Find ways to praise your children often，________ you'll find they will open their hearts to you.(2011·山东)
A．till B．or C．and D．but
Sometimes proper answers are not far to seek ________ food safety problems.
A．in B．to C． on D．after
