There is one mistake in each of the following questions. Detect and correct the mistakes. Write your corrections together with the mistakes on the blanks.（2*10=20）
Example: Who’s taking care the dog while you’re away?
taking care → taking care of
21. The embargos on shipments from certain countries encourage trade with friendly nations.________________________
22.Sinopec plans to set up joint ventures with three foreign oil giants, allow them each 500 stations within three years. _________________________
23. There is usually more labor piece among office workers than in factories._________________
24. Although he joined the firm only last year, he is already senior than me.________________
25. He told me that New York is larger than any city in America.________________________
26. The garments have been cleaned and are ready-to-wear.__________________________
27. His missing the bus is an every day occurrence.___________________________
28. No one but my friend and me spoke up during the discussion. ______________________
29. The management is content to the turnover accomplished this month.____________________
30. Walking down the street, many tall buildings began to appear before me.__________________

21. The embargos on shipments from certain countries encourage trade with friendly nations.___encourage→discourage_____________________
22.Sinopec plans to set up joint ventures with three foreign oil giants, allow them each 500 stations within three years. _______allow→allowing__________________
23. There is usually more labor piece among office workers than in factories.____than ＾those in factories_____________
24. Although he joined the firm only last year, he is already senior than me._________rahter than_______
25. He told me that New York is larger than any city in America._______any other city_________________
26. The garments have been cleaned and are ready-to-wear.______ready to wear____________________
27. His missing the bus is an every day occurrence._______every day→everyday____________________
28. No one but my friend and me spoke up during the discussion. _____me→I_________________
29. The management is content to the turnover accomplished this month.______to →with______________
30. Walking down the street, many tall buildings began to appear before me._____I Walking down the street,_____________