Explanation

The execution time or CPU time of a given task is defined as the time spent by the system executing that:

the task, including the time spent executing run-time or system services on its behalf.

Explanation

The control unit (CU) coordinates the functions of a computer system.

The information stored in the memory unit (e.g. hard disk drive) is extracted and decoded 

and executed by the control unit to demand help from ALU whenever required.

CPU contains a register where the processing of arithmetic operations of data occurs.

Explanation

the sentence belongs to the past sentence 

STOLEN is the past participle of steal.