Recycling is one way to protect the environment; reusing is ___.
A man does not know the difficulty of anything_________ he does it personally.
I caught the last bus from town, but Harry came home___________ that night.
Mrs. Green wants to buy that kind of cloth because she___________ that the cloth__________ very well.
_______ Tom, we wouldn’t have been late for the last bus.
The twin brothers stand under the tree, ______ and say nothing.