One possible version:

Hi! David,

I’m glad to hear from you. The best time to come to Beijing is during the Spring. The weather is not too hot or too cold, so it is the perfect time of the year to be outside. During the Spring in Beijing everything seems fresh and new.

I advise you to visit the Summer Palace, the Great Wall, and the Temple of Heaven. The Great Wall is one of the wonders of the world and it is an amazing place to visit. The Summer Palace and the Temple of Heaven are beautiful too. There are royal buildings, fantastic artwork, and scenic views for people to enjoy.

Before you come to Beijing, you should know that Beijing is a very crowded and big city. So it is necessary for you to travel with a map and you must be patient about waiting in line or large crows.

I hope you will have a nice trip.

Yours,

Li Ming

题目分析：这是一篇给材料作文，戴维德在来信中提出了几个问题，所以我们在回信中对来信内容都要有所回应。结合材料内容，可知本文主要是第二人称，一般现在时态进行叙述。语言的表述应该符合语法的结构，造句应该符合英语的表达习惯。适当使用连词，做到上下文联系紧密，符合逻辑关系。

【亮点说明】这篇短文使用了大量的固定句式和短语，为文章增色不少。如:hear from收到……的来信等。多种句式的使用是本文看起来既条理清楚，又语意连贯。学习中注意总结,牢记一些固定句式及短语,写作时就可以适当引用, 让文章更出彩。