Câu hỏi tiếng anh văn phòng Lan

Question 1: This is how Lan wrote the subject of her email. Is it suitable for a business email?
Subject: INVOICE FOR MID-AUTUMN PARTY IN HOI AN

Question 2: Lan needs to send an email to the point of contact named Lea Santos. How should she address the recipient in the email?

Question 3: Lan needs to say sorry for her late response. Pick the most suitable sentence to complete the paragraph.
I am writing this email to apologize for my late response regarding your request #12745 .________________. That is why your email failed to reach my inbox last Friday. The bugs have been fixed now and we highly appreciate your sympathy.

Question 4: In the email, Lan has to attach three files for her clients. How should she inform the clients about these files?

Question 5: Below is a screenshot of her email attachments. What do you think about them?

Question 6: Check this paragraph from the email and pick out one inappropriate sentence.
As we have discussed, the invoice should be kept confidential until further notice. The process would normally take 2 or 3 weeks. In case you need assistance, please feel free to contact me. By the way, I like the necklace you wore in the last meeting.

Question 7: Lan is wondering how to close her email in the right way. Could you help her?