When doing environmentally friendly farming, farmers______.A．leave some space for birdsB．s

When do you finish your college course？（英译中)

Once environmental damage, it takes many years for the system to recover.A．had doneB．is do

When did hydroelectric power was universally considered as an environmentally safe and cle

According to the passage when people are doing la

Once environmental damage it takes many years for the system to recover.A.had doneB.is do

What was the man doing when the woman approached him?A.Reading.B.Sleeping.C.Doing research