Once harm is _______ to the eco-system,all species will ____

Once _______, this power station will supply all the neighbo Once ____,this power station will supply all the neighboring Once harm is done to the environment,it takes years to have All e-mails from the system will be sent to this address. once the food is in your hand ,it is _______ to you to make Once harm ( )to the environment,it takes years to have the s The idea,once ____ to the article,is certain to make it more Don't learn to smoke,or it will ____ harm to you As is known to all,the moon travels around the earth once ev The captain commanded that all the soldiers ____ at once. lt is harm to the environment有什么错么? waste gas is _____(harm) to the environment