Kathy and Anne are good friends. Recently, Kathy invited Anne

to attend her 16th birthday party. Anne accepted the invitation. On Kathy’s birthday, however, Anne went to see a movie with some other friends and forgot all about the party. At school the next day, Kathy asked Anne why she hadn’t come to the party. Anne blushed because she suddenly remembered the invitation and felt embarrassed that she had forgotten. She wanted to tell the truth but she said something else instead. “My dog got sick and we had to take him to the veterinarian,” she replied.
“Really?” asked Kathy. That’s strange...