A.of aposition，──
B.at aposition，──
C.in aposition，with
D.at aposition，with

A.As request
B.At request
C.As requested
D.At requested

A.which
B.at which
C.from which
D.in which

A.please
B.pleased
C.pleasure
D.in pleasure

A.had
B.have
C.has
D.having

A.with
B.to
C.for
D.than

A.developing
B.developed
C.develop
D.development

A.accepted
B.to accept
C.accepting
D.accept

A.aware
B.aware of
C.are aware of
D.are aware

A.on，of
B.at，with
C.in，for
D.with，at

A.of a position，──
B.at a position，──
C.in a position，with
D.at a position，with