Tom is( )good English boy.括号中填冠词a还是an,原因是什么?

Tom is good _____Chinese Mary is good at English.Lucy is good at Englis=_____ _____Mary____ ____Lucy is good at Englishi doesn't do well in math a ( ) he is good at Englis doesn't do well in math ( ) he is good at Englis Tom is a healthy boy.同义句 Tom is ( ) good ( ) tom s____ is a really good boy Tom is a good _____(cook) Tom is good at swiming.同义句 little tom is good ( ) english填介词 tom is a ------(good)pupil he sings very -------(good) Tom is his good friend.改为同意句Tom is ____ good friend ____ ____. Tom's grangparent is in good----(healthy)(填空,Tom's grangparent is in good----(healthy)(填空, The boy is Tom.() is my good friend this is tom he is me good ———. tom is a running star.she is a good runner. Tom is his good friend.(同义句）Tom is ____good friend ___ ______.速回! Tom is good at playing vlleyball.同义句.Tom is ______ ______ volleyball ______ You can speak English as( )as Tom( )A well;doesB good;speakC good;doesd good;is