Do me the favor -- on the radio.Do me a favor --- on the rad

Do me the favor __ on the radio. Do me a favor ___ on the radio这2个题目一样,答案肯定一样.这1句话已经有谓语动词了,不能单独再填动词,需要填不定式to do,这里填to turn.
第三个Do me the favor----turn on the radio,这句之所以填turn,关键点在于符号----,表就是··之意,帮我个忙——打开收音机