______ to somebody , a British person often shakes hands with the stranger . 
#98543
A
Introducing
B
To introduce
C
To be introduced
D
On being introduced
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If I         long enough to have a job, I would choose to be a doctor,      those AIDS patients.
#90980
A
had lived; helping
B
should live; help
C
were to live; helping
D
should have lived; help
The lecture ________, a lively question-and-answer session followed.
#88387
A
being given
B
having given
C
to be given
D
having been given
The library needs ______, but it will have to wait until Sunday.
#97980
A
cleaning
B
be cleaned
C
clean
D
being cleaned