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Seeing that the drowning child was struggling in the icy water, the soldier dived into the river without hesitation, ___ his own safety．

_____ all our efforts to save the school, the authorities decided to close it.

With a population of over seven million, London is ________ the largest cities of the world.

Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.

To fully understand the writer, we must read not only between the lines but also ________ the lines to know what is implied in the article.

Many people are ________ as to what to do when there is a fire.

The job is not very rewarding ________ money, but he is getting valuable experience from it.

He has got the job because he has the advantage ____ others of knowing many languages.

Do you know that Britain trades         many European countries      furs and skins?

This exam is very difficult. Many students are concerned ________the results.