书面表达
假如你是David，你的同学Vince邀请你去参观他家的农场(farm)，但你因为太忙而不能去。请根据以下提示写一封80词左右的电子邮件。
提示：今天是星期五，放学后你要去看望祖父母。第二天上午得帮爸爸在花园里干活，下午和妈妈一起去购物。星期天上午要为物理测试做准备，晚上与朋友们去听音乐会。
Dear Vince,
Thank you for                                                                  
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
Write soon.
Yours
David