____ most children nowadays are the only chidren, they tend to be more self-centered．

________ they heard the shout for help，they rushed out.

 The girl wearing a pair of dark glasses comes from a city in South China, ______ is evident from her accent．

 ------What do you think of our design for the new car？------Pretty good. But I find theirs is _____ worth considering and studying.

The U.S. official said North Korea --- and Iran --- should follow in the steps of Libya, which last December said it would work__________ to allow international weapons inspectors to do their work.