Recycling is one way to protect the environment; reusing is _____.

Good families are much to all their members, but ________ to none.

—Which of these two dictionaries will you buy？ —I'll buy _____ ,for the different uses.  

He had lost his temper and his health in the war and never found________of them again.

I would appreciate ______ very much if you could change the plan a bit to make it more workable.