6. Choose the best answer to the following definition

26.Task II. Read the text and complete it with suitable words.
Processing. The nerve center of a PC is the processor, also called the CPU, or central processing unit. This is built into 16. ______ which executes program instructions and coordinates the activities that take place within the 17. ______ system. The chip itself is a small piece of silicon with a complex electrical circuit called an integrated circuit.

The processor consists of three main parts:

-The control unit examines the instructions in the user's program, 18. _______ each instruction and causes the circuits and the rest of the components - monitor, disk drives, etc. - to execute the functions specified.

-The arithmetic logic unit (ALU) 19. ________ mathematical calculations (+, etc.) and logical operations (AND, OR, NOT).

-The registers are high-speed units of memory used to store and control data. One of the registers (the program counter, or PC) keeps track of the next instruction to be performed in 20. ________. The other (the instruction register or IR) holds the instruction that is being executed.

1. 
   A) *a single chip B) a program C) a disk D) millions of chips
   
2. 
   A) * computer B) monitor C) software D) processor
   
3. 
   A)* interprets B) have interpret C) interpreting D) had interpreted
   

19. A)* performs B ) performed C) will perform D) performing

20. A)* the main memory B) hardware C) the data D) platform