参考例文：
Dear Mary，
This city has changed a lot in the past 5 years. First，more high buildings have appeared，which are modern and beautiful. Many overpasses have been set up，so it has become very convenient for people to travel. Besides，many families have got cars of their own. The people's life here has become rich and colorful. People can enjoy themselves travelling on holidays. To my delight，I can taste delicious food of different countries such as the food of America，Japan and South Korea. And now it is easier for me to keep in touch with you than last time，for I can email you in my office.
亲爱的玛丽，
这座城市在过去5年里发生了很大变化。首先，越来越多的高层建筑出现了，这是现代的，美丽的。许多立交桥已经建立，所以人们出行变得非常方便。此外，许多家庭都有自己的车。这里的人们的生活变得丰富多彩。人们可以在假期享受旅行。让我高兴的是，我可以品尝到不同国家的美味食品，如美国、日本和韩国的食物。现在我很容易和你保持联系，因为我可以在办公室给你发电子邮件。
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