Millions of people around the world suffer from a painful addiction to biting their nails，which can be harder than smoking cigarettes．
| A．to be quitted | B．to quit |
| C．to have quitted | D．to quitting |
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You should not show any ___ for the students who get caught cheating in examinations.
| A．sympathy | B．assessment | C．guilt | D．comment |
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_____ in an atmosphere of simply living was what her parents wished for.
| A．The girl to be educated | B．The girl educated |
| C．The girl’s being educated | D．The girl was educated |
.
___ from the motherland for about a century, Hong Kong returned to China in 1997.
| A．Being separated | B．Having separated | C．Having been separated | D．to be separated |
.
Gun control is a subject _____ Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
.
With a basket on her back, the little girl is walking along the stream with green grass and red flowers ____ on both sides.
| A．to grow | B．grown | C．growing | D．being grown |