不礼貌的现象在我们的校园时有发生，请大家把这些不礼貌的现象记录下来，作为自己行动的警戒。
Bob has got good exam results. His parents are proud of his ______.
5＋2=____
2＋6=____
4＋5=____
7－3=____
下列关于显微镜的使用不正确的是
