Please write a letter to Keith Brown， the Purchasing Manager of ANA Enterprises. Their address is, 100 George Street, Sydney, NSW, Australia, 1.（）. Tell them that we have agreed to a 4% reduction 2. （）that we originally quoted them for the supply of. 3.（）. The same 4.（） still apply. And the reference number on their letter is 03/5879. The letter is dated 1st February this year. Have our reply ready for me to sign 5. （）, please.

第四空应填入（）。

Please write a letter to Keith Brown， the Purchasing Manager of ANA Enterprises. Their address is, 100 George Street, Sydney, NSW, Australia, 1.（）. Tell them that we have agreed to a 4% reduction 2. （）that we originally quoted them for the supply of. 3.（）. The same 4.（） still apply. And the reference number on their letter is 03/5879. The letter is dated 1st February this year. Have our reply ready for me to sign 5. （）, please.