下列句子错在哪里?

下列句子错在哪里?
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-wear27.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