Mrs Cheng said it is better one book used for 2-3 weeks to change another, the methods is repeat and repeat, let the baby remember the words.
886! if I have time, let me try to make dna.....however, there are too many disks, and too many requests will be, I may not afford the demand..forget it :wink:
go la, bye, if you have anything talking to me, just pm me la.