增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Personally, I think honesty education is basic necessity. First of all, course on honesty should be offered to students, and activities like story-telling and lectures are also worth tried. With the concept of “being honest” deep rooted in their minds, honesty can be reflected in our daily life and study. However, related rules and regulations should be applied for evaluate students in aspects such as homework, tests, and relationships with teachers and parents. Last but not least, we'd like strict measures carrying out to punish those that cheat constantly. As a result, they must take responsibility for their bad behaviors, thus reducing chances of cheating the next time.

如图，四边形ABCD内接于⊙O，AB为⊙O的直径，点C为的中点．若∠A=40°，则∠B=____度．

牙齿对动物的生存和生活具有重要意义，如图是某动物上、下颌骨及牙齿的示意图，请据图回答下列与牙齿有关的问题．