(a) Discover a suitable word from the box below to complete the following sentences. comments action optional pre-processor header syntax mandatory zero looping sequential decision nesting 1. Programmers insert to document programs and improve program readability. 2. Lines beginning with a # are processed at time. 3. Normally, statements in a program are executed one after the other in the order in execution which they are written. This is called 4. The diamond flowcharting symbol is also called the symbol. 5. The rectangle flowchart symbol is also called the symbol. 6. Indentation in the if selection statement is always 7. Having a loop within a loop is known as 8. Placing a semicolon after the right parenthesis enclosing the parameter list of a error. function definition is a file. 9. Each standard library has a corresponding element 10. The first element in every array is the (LG