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