A great deal of advanced science and technology has been _______ since China carried out the reform and opening policy.

If you go on doing so, you’ll __________ yourself sooner or later.

It’s nearly 5 years since I worked in the company. I _______ in a school.

The book, which sells well, is         on a true story.

The British science fiction writer, Isaac Azimac, believes that robots are_____ ever to do harm  to a human being.