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.
Some students think it's necessary to have foreign teachers because it can provide us with a better opportunity to learn English. We can practice spoken English with native speakers and improve our language abilities. Moreover, it can make us more interested in the English language. We can learn more about some foreign customs and culture.
On the contrary, some other students are strongly against the idea. They think the most important thing for us is to be admitted into universities. However, having a foreign teacher seems to be no good to improve the academic achievements. And it may cause some trouble while communicating with them as there is culture diversity. What is worse, it costs a lot of money to employ foreign teachers.
Anyway you are Principal. It's up to you to decide whether to employ foreign teachers or not.
Best wishes.
Yours sincerely,
Lihua