Which sentences are opening/closing remarks?

• Группы
  • Opening remarks?
  • Closing remarks?
• Варианты
  • Well, I think that’s about it.
  • I must go now.
  • How are you?
  • Thanks for your email.
  • I haven't heard from you for ages.
  • It was nice to hear from you.
  • Well, that’s all for now.
  • Write soon.