The program memory serves basically as a place(66)instructions, the coded pieces of data(67)direct the activities of the control processing unit(CPU). A group of(68)related in- structions stored in memory is referred to as a program. The CPU "read" each instruction from memory a logically(69)sequence and "use" it to initiate program action. If the program structure is coherent and(70), processing procedures produce intelligible and useful results.

A．stored

B．to store

C．to be stored

D．storing