题目内容：

Billy，a British boy，is in Shanghai for his holiday now. He wants to send her Mum a postcard. Suppose you are Billy，please complete the postcard. （来自英国的Billy在上海游玩。假设你是Billy，请给Billy的妈妈写一张不少于60个词的明信片。）

Use the following points as a reference. （以下问题仅供参考）

1. When and how did you arrive in Shanghai？

2. Which interesting things have you done in Shanghai？

3. How do you feel about the city you visited？

Dear Mum,

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Sincerely yours

Billy