A blonde was being a substitute teacher for her friend. She figured that it would be best if she wrote everything on the board for the kids, so it would be easier for them to understand.
During math class she said to the class, "Ok class, it is time for your math test. I will write the problems for the test on the board." So she did it, and they took the test.
Later in science she said to the class, "I will write the questions to your science assignment on the board." So she did and they took the test.
Then later in spelling, she said to the class, "Class, I will write the words for your spelling test on the board."