Our society has changed and （ ） in it.

It is the ability to do the job （ ） matters not where you come from or what you are.

Plastics is a kind of （ ） which is widely used in industry.

This project is said （ ） right now and so far everything is going on quite smoothly.

The example of the personal computer shows that ________.

Nobody was （ ） in the office when the manager suddenly had a heart attack.

Change in climate may have caused_________.

A beam of light will not bend round the corners unless () to do so with the help of a reflecting device.

The degree （ ） you maintain your mental health may depend on certain simple environmental factors.

（ ） I admire David as a poet, I do not like him as a man.

Neither Bill nor his parents（ ）at home.

David Smith refers to himself as having been “a clothes addict” because( ) .