creation: 8/13/99; revised 05/21/03
Instructions: This is an ungraded fill-in-the-blank exercise. Each question consists of a sentence with one or two words left out. A button represents the missing word(s). For each question, think of the word or phrase that should fill each blank, then click on the buttons to see if you are correct. No grade is calculated for this exercise.
10. Say you want to append the output of the program to the end of a file called output.txt. Fill in the blanks to do this.
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