Questions 1 to 5 are based on a interview. At the end of the conversation you will be given 10 seconds to answer each of the following the questions.
Now listen to the interview.
According to Debbie Miller, the most difficult problem for a teacher is ______.

A．trying to deal with a group of kids crowing around your desk between class periods
B．having a kid in your class who sits in the corner of the room and never opens his or her mouth
C．having so many students and not being able to do enough for them
D．trying to get the students’ affection