下列命题：①同位角相等，两直线平行；②全等三角形的面积相等；③对顶角相等；④角平分线上的点到角两边的距离相等，它们的逆命题是真命题的有______．

书面表达。

为了加强英语教学，你校准备高薪聘请外教来校任教。有些同学认为有必要，而有些却不以为然。请就此事给校长写封信。阐述聘请外教的利和弊,供校长参考。

要求:

1.利和弊至少各包括3个理由。

2.字数100左右。  

3.开头、结尾已给出。

Dear Principal:

These days all my classmates are talking about employing foreign teachers.

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Anyway you are Principal. We believe you will make a wise decision.

Best wishes!