What must be done if wildlife protection to be succeed?回答这个问

What must be done if wildlife protection to be succeed?回答这个问 something must be done to solve the problems（）succeed What should ____ must ____.A do,do B be done,be done C to be what to be done be to be done可以改成must be done 怎么回答What should be done to save the earth? What should be done to help unemployed people?英语回答 what is to be done? What\'s to be done? Justice must not only be done,but must be seen to be done something must be done I must in be able to succeed together with you