6. The device as set forth in claim 1, wherein the adding means comprises a register circuit.
6. The device as set forth in claim 1, wherein the adding means comprises a register circuit. 7. The device as set forth in claim 6, wherein the register circuit comprises: a first register responsive to the first means for storing the selected sentence; a second register responsive to the second means for storing selected words to be added to the selected sentence; a control circuit for controlling the first register and the second register to add the selected words to the selected sentence thereby obtaining the complete sentence; and a display coupled to the control circuit for displaying the complete sentence.