Office raffle show

10÷20= 1 2 ,

7÷20= 7 20 ,

3÷20= 3 20 ;

Because 1 2 > 7 20 > 3 20,

Therefore, Xiao Ming is likely to get a performance and singing, and more singing programs should be prepared.

A: The probability of Xiao Ming being chosen to perform singing is 1.2, the probability of performing dancing is 7.20, and the probability of performing recitation is 3.20.

So the answers are:12,7 20,3 20.