单项选择题

The roles expected ___________ old people in such a setting give too few psychological satisfactions for normal happiness.

A．of
B．on
C．to
D．with
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单项选择题
If the letter (to be mailed) (was placed) on the writing table an hour ago, it (is) certain (being) there now.
A．to be mailed
B．was placed
C．is
D．being
单项选择题
Doctors see a connection between increased amounts of leisure time spent ___________and the increased number of cases of skin cancer.
A．to sunbathe
B．to have sunbathed
C．having sunbathed
D．sunbathing
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