填空题 1.failure 2. go 3. latest 4. notify 5. progress 6. buy 7. collection 8.addresses 9. time 10.sincerely 11. due 12. interested 13. more 14. hands 15. receive 16.produce 17. deal 18.alternative 19. proceedings 20. enclose 21. advantage Dear sir: I am afraid your __(1)______ to settle your account, which is over ____(2)_____ for more than six months, will leave us with no ______(3)___ but resort to legal ____(4)_____ . This is to _(5)_______you that unless we ____(6)______ your check for $7,550.50 ___(7)____June 30, we will place your account in the ___(8)_____of our attorneys for___(9)_____ . Yours __(10)_______ , Chen Yan Dear sir or madam, If you need an air-conditioner, buy Chun Lan’s___(11)____ model. Why? Because its durability is about two times that of other air-conditioners. What’s___(12)_____ , the price is at least fifty percent lower. In the past decades, a great__(13)______of air-conditioner plants have come and __(14)_____ . But Chun Lan has constantly grown and made striking___(15)_____ in sales and prestige. Back of every Chun Lan is one of China’s largest factories__(16)_____air-conditioners. Back of every Chun Lan is the capable engineering staff that you will find in no others. Please write on the __(17)_______ card the names and ___(18)_____of those who might be___(19)______ in learning more about Chun Lan. Thank you very much for your____(20)_____ . Sincerely yours, Dona Lee Sales Director