Once harm is _______ to the eco-system, all species will ________, including man himself.

_____ all my teachers, MrMoore is the one who impresses me most

We should look up to _________ lend a hand to the people in trouble.

He left ______ with my secretary that he would call again in the afternoon.He said he would keep ______.

The price of the pen is not _____ but books are always very _________.