I have___eraser.A .an B.a 这个该填什么?

I have___eraser.A .an B.a 这个该填什么? a[i] A:A(int i):a(i), I have a desk.I have a I am a creep,I am a i=!a I need a doctor. i=(a+k) I am a people. I Need A I am a policeman? i wan a love I am a computer. i got a boy I got a I need a friend! i'm take a I am a policeman.