If we keep wasting so much energy, ________ are that our oil wells will dry up and the environment will be destroyed.

In my opinion, it was really a great ______ for her to be pleasant to people she didn’t like.

Confidence is more than just an attitude; it comes from a strong commitment to take_____,   rather than just let life happen.

A sense of __________ is the basic requirement for people working in the service industry, such as education and health care.

When I heard about the marriage of Andy Lau, you could have knocked me down with a _______ .