很高兴为您解答!
1.提问：How many people get to know her on TV多少人从电视中认识他?（因为划线部分是数字,对数字提问用how many)
2.When did you arrive at the airport.你什么时候到达机场?（因为arrive是不及物动词,所以其后跟宾语要跟介词at,arrive at =reach)
希望可以帮到您,