注意：1、词数100 左右。
2、可以适当增加细节，以使行文连贯。
参考范文
Dear Frank,
How happy we are to know that you’re going to participate in our Chinese Idiom Contest. Here is what you are supposed to know about.
We're going to hold the contest in the school library at 8:00 a.m. on December 20, 20_. Characters wrongly usedare to be recognized in some Chinese idioms. Besides, you are required to say out the idioms by guessing gestures of your partner. Hopefully,what I have to remind you of is that you’d better get one story of idiom prepared in case you are probably invited to tell one. By the way, all our Chinese teachers will be invited as judges.
Expecting your excellence in the approaching contest. Best wishes!
Yours，
Li Pin
