1. Tell me the advantages and disadvantages of CAI。

【Suggested version】
The major merit of CAI lies in its concept that students are the body of the class, which means that teachers are the guide and helpers of class by using computer to teach the new knowledge. The advantages of CAI are as follows:
First, it contain not only pictures and words but also sounds, which can to some degree boost students’ interests of learning English; And CAI is a great help to improve the pace of teaching, for it involves a lot of information that can increase the opportunities to practice English; Setting a situation also can be one of its merits. Associating with the text and author’s opinion, a teacher can arrange and design various of questions and exercises to train their divergent and creative thinking.