Complete the following sentences.

$1.$ The $\_\_\_\_\_\_\_\_\_\_$ indicates the address of the current instruction to be executed, which is

stored in the memory.

$2.$ Because $\_\_\_\_\_\_$ are located inside the CPU, they are much faster than memory. So$,$ we

should try to keep variables in them.

$3.$ A program is logically divided into two parts: a code part that contains only the

instructions, and a data part that keeps only the data. The $\_\_\_\_\_\_\_$ register points to

where the program$$s instructions are stored in the main memory, and the $\_\_\_\_\_\_\_$

register points to the data part of the program. The $\_\_\_\_\_\_\_\_$ register points to the

program$$s stack segment

$4.\_\_\_\_\_\_\_\_\_$ are a type of instructions that must be only used in the data segment.

$5.$ Regarding endianness, the $\_\_\_\_\_\_\_\_\_\_\_\_$ seems more natural for English speakers

because they read sentences from left to right.

$6.$ The $\_\_\_\_\_,\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_,$ and $\_\_\_\_\_\_$ are composed of $16$ bits. They are known as

the arithmetic, base, count, and data registers, respectively.