在英语写作中，通知的开头可以根据不同的场合和受众采用不同的表达方式。以下是几种常见的开头方式：

口头通知开头语

May I have your attention, please？ I have an announcement to make.

Attention, please？ I have something important to tell you.

书面通知开头

Notice.

Dear friends,

正式场合的通知开头

Ladies and gentlemen,

明确通知主题和目的的开头

We are pleased to announce that...

I am writing to inform you of...

简洁明了的通知开头

Attention, please! I have an important notice to make.

根据你的具体需求和通知的场合，可以选择以上一种或结合几种方式来开头。确保开头简洁明了，能够迅速吸引读者的注意力，并明确传达通知的核心内容。