Problem practice some Topic we cannot practice it is because the system has a problem, but we have a Topic that is already up, in spite of the time, we did not practice in the Topic.
Topic problem doing some exercises we can not do the exercises. It is because the system has a problem, but when we graduated Topic that the system is up to the time when we did not do the exercises in the Topic.
Problems and exercises, some Topic we cannot do the exercises. May be because the system problems, but once we graduate Topic cuisine. The system up time study even though we haven't do exercises in Topic.