填空题

Dear Mr. Black,
Thank you very much for your letter of Nov. 4, ordering one of our products: Type 5 Sewing Machine. I am sorry to say the order for this type of machine has been cancelled be cause of buyers’ suggestions.
Maybe you, as other customers did, will want a substitute for this—Type 6 sewing machine. Here we enclose the brochure (小册子) of this new type. Please pay attention to the advantage and improvement of this machine. If you’d be interested in this product, we’d be really glad to accept your next order.
Look forward to hearing from you soon.
Your sincerely,
Li Kai

What is the purpose of Mr. Black’s letter of Nov.4
The purpose of Mr. Black’s letter of Nov. 4 is to().

【参考答案】

order products/order Type 5