Holiday is ______ time for leisure. But making good use of ______ time is not an easy task for most people.
It is difficult for any of us to eat better, exercise more, and sleep enough, ________we knowwe should.
The computer is ________ to be one of the greatest inventions of the 20th century.
--We________ in advance. Look, this restaurant is almost empty.--Yes, just in case.
Try to appreciate the world from another angle ________ you will find how wonderful life is.
I like to make ________friends with Mary because she takes________ lead in everything.