“answer”前面是加“a”还是加“an”?

“answer”前面是加“a”还是加“an”? eraser前面是加a还是an advice前面是加a还是an taxi前面是加a还是加an? a right answer还是an right answer请问right answer前加a还是an A前面加an 还是a 快 hour前面是加a还是an?说明原因哦 NBA player前面是加a还是an? 请问下面这些单词前面是加a还是ancleaneractressdriverartistsingeraccountanengineersalesmandoctoractor uniform前面加的是an还是a? popular前面的冠词是加a还是the japanese city前面是加an 还是a 英语单词 sad 前面 加a 还是an? o前面加a还是anhurry. infortian前面加a,an还是the? amusement park前面加A还是An European 前面加a还是an hair的前面加a还是an