A British scientist has predicted that parents who lose children in accidents may be able to clone “copies” to________ them within 50 years.
The great use of school education is not so much to teach you things _____ to teach you the art of learning.
I heard that you really had a wonderful time at John's birthday party, _____?
Modern science and technology has _____ communication between people far apart.
Under no circumstance _____ to tell lies to parents.
The professor said he could talk on _____ interested the audience.