填空题 Dear Mr. Robert,
Although we sent you your goods on time, we have waited nearly two months for you to pay the balance of $5000, which is over due. When you ordered the shipment of computers, you requested that we send you the entire order no later than June 1, and we shipped the goods by air freight on May 25.
As you agreed in our original credit arrangement (赊账协议), payment was due in 30 days, on June 30. Yet, as it is already August 26, we still have not received your payment. In fact, we have not received any answer to the notice we sent to remind you that the payment is due.
We regret to say that if we cannot receive your payment by September 15, we will be forced to ask our lawyer to take measures and collect it through legal procedures.

填空题 What's the purpose of the letter?
To urge the buyer to ______.

填空题 When was the buyer supposed to pay for the order according to the agreement?
On ______.

填空题 How did the Western Company deliver the goods?
The goods were delivered by ______.

填空题 If this letter won't work, what is the Western Company going to do?
The company will settle the matter through ______.

填空题 What's the deadline set by the seller for the buyer to make the payment?
It's ________.