Nowadays some children are often playing games on the computer. I don't think it a good idea for children to play too long on computer. Because it is bad for their eyes. Second there are some information which doesn't fit children. Third playing too long can certainly affect their study. Besides ,sitting in front of computer will do harm to children's health. In a word, it is a waste time and money for children to play on computer. So they should turn their attention to their study. Or they can do some volunteer work in their neighbourhood.