35. Please keep us ____ of any change of address as soon as possible.
A. informing B. informed C. being informed D. to inform
34. Progress so far has been very good. We are, ______, confident that the work will be completed on time.
A. however B. otherwise C. therefore D. besides
33. ---Have all the mysteries been cleared up?
--- Almost. But ______ only one question ______.
A. there remains; answered B. it remains; to be answered
C. there remains; to be answered D. it remains; answered