banana前用a还是an

banana前用a还是an banana前加a还是an 是a banana 还是an banana banana的单数是加a还是加an? a banana and an apple 还是 a apple and banana.in schools and homes 还是 in schools and homes? hour前用a还是用an onion前用介词a还是an mp3前用冠词a还是an University前用不定冠词a还是an? Australian前用a还是an exchange student 前用a还是an? useful one前用an还是a unit前用an 还是a数 european girl 前用a还是an ugly 前用a 还是 an fire engine前用a还是an color前用a还是an approval 前用a还是 an