We need to bring our books, because to be coupled in teaching and practice. When we do not understand, you can look in the book and to the work, such as the group, make up dialogue. If we do not, you can see a sample from the conversation in the book. It is very important. If we do not bring. Time, we will not understand. If you do not see in the book. If you know some of you may admonish or some will deduct the points, it would be something nice.
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