林毅夫的经济学观点:what we can do to prevent bird flu?

what can we do ? what we can do to prevent bird flu? What can we do with a computer What can we do on Christmas? What can we do to protect animals and plants that are being endangered? I'll do what we can to study English well,为什么这句话中要用to study WHAT CAN DNA HELP TO DO ? What can we do for the 2008 Olympic Games? What can I do to make it up to you ？ what should we do to protect our cultural relics