利用紫外线可使荧光物质发生荧光，人们制成了（     ）

假设你是李华，你的英国笔友Mary想了解一下你将参加的2017年山东省英语夏令营（English Summer Camp）的有关信息。请根据下列信息给她写封信，谈谈有关情况和活动的意义，并邀请她参加你们的活动。

活动地址：山东济南

时间：2017年7月底，共7天

参加人员：来自全国各地的英语爱好者；中，美，英，澳四国的英语老师

活动内容：举行英语演讲比赛，交流英语学习经验，了解各国的文化，游览济南的名胜。

注意：1）内容必须包括以上提供的要点，可以适当增加细节，使内容连贯；

2）词数，100词左右。

Dear Mary,

    Nice to hear from you again!

       Do you remember who gets angry because you forget to tidy up your room before going out? Do you remember who feels 1 with your dress from head to feet? This person is2 your boss nor your friend. It's funny that you have to 3 to her even though you sometimes don't like to hear anything she has said. It’s our mother, a great 4 in the world to us.
       I always5 my mother if we have a “long time no see”. But this kind of missing is always quieted down by 6 because I come back home for comfort and 7 but mum always puts more pressure on me. Of course, I know she 8 about me too much and just has a lot of words to tell me. But the 9turns to be pressure. On the other hand, I hurt her and make her feel lonely even though I am 10 her. Then what can we do? This problem is really hard to deal with. I think not 11 I have this problem. Here are my ideas. When we find there are some unhappy things going to12, shall we just stop for 30 13? Give me a chance to rest in your arms and we sing a childish song together just like when I was 14? I need your love indeed but without telling me to do as you wish me to. And then let's go out for a walk hand in hand. Tell me what's in your 15 gently and slowly. I will feel better if you don't just pour them out.