These diagrams are especially helpful when we have a concrete problem ________ at hand.
29. Jim passed the driving test, ____ surprised everybody in the office.
28. Last month, part of Southeast Asia was struck by floods, from ____ effects the people are still suffering.
27. ---Why does she always ask you for help? ---There is no one else ____, is there?
26.He was educated at a local grammar school, ____ he went on to Cambridge.
25.I have many friends, ____ some are businessmen.