这个填a 还是an

这个填a 还是an jacket is black..这个________jacket is black是填a,an,the,还是不填冠词 _____American boy是填a还是an （ ）jacket ( )里填a还是an He is _____ NBA basketball player 这个空填a还是an She's _ housewife填a还是an什么情况填a什么情况填an it is [ ]n 是填a还是填an? （ ）old woman是填a还是填an have you seen an umbrella here? ____black one?it was here minutes ago.这个空该填a还是the? I have___eraser.A .an B.a 这个该填什么? ()800-metter races 括号里填an还是a Have you got _____one yuan coin?填a还是an （ ）encourager括号里面填a还是an? This is _____easy exercise填an还是a The car is____ugly colour 填a还是an Yao Ming is () NBA player.填a还是an She reads for____hour every day填a还是an Can you see ( ) M 填a还是an 为什么