i am sorry i can not go to the party. i am a_______ meeting

i am sorry i can not go to the party. i am a_______ meeting I am sorry,I can not go to your party I am sorry I can not go to my friend's party,because I am b_ 1、—I am sorry.I can’t go to the party I am sorry I can't go to my friend's party,because I am b___ I am sorry,()I can not go to your party.BUT还是AND 并说明问什么 I am sorry,( ) I can not come -i am afraid you can not go into the building -sorry .i ____ I am sorry,"------".I have to go to the doctor "------". I am so sorry to have come late for the meeting.---it is not If i am f_,i will go to the party. Sorry I can not come to the phone,I am a bit tied up at the