In order to make students become more interested in English studies,21 elementary schools in southeastern Korea have started to use robot teachers. The robot teacher is called Engkey. She was developed by the Korea Institute of Science and Technology. She is about one meter high and is white,egg-shaped. She takes a display panel  as her face. She can move around the classroom while she speaks to students. She can also read books to students and dance to music by moving her head and arms. Now,21 robot teachers have been used to teach English. They are controlled by English teachers in the Philippines. There is a camera in each of the robot teachers. With the help of the cameras,English teachers in the Philippines can see and hear the students. At the same time,the facial expressions of these English teachers. This is very interesting. Besides helping students to become more interested in English,the robot teachers can also help children in poor areas without English teachers. Robot teachers have many good points. For example,they needn't have a rest because they don't get ill. The robots can do the following EXCEPT  _  .
moving around the classroom reading books to the students dancing to music helping students do their homework