Many workers were organized to clear away remained of the World Trade Center.

The organization broke no rules, but ______had it acted responsibly.

A survey was carried out on the death rate of those who were infected by SARS, ________were surprising.

In recent years much more emphasis has been put______ developing the students productive skills.

_____ of water makes Death Valley a desert, but it is by no means devoid.

There are some police cars in front. What do you suppose _____?

Tina _____ have known the truth, or she would have told us.

_____ their real economic situations, they got some relief fund from the government.

No matter how frequently _____ the works of Beethoven always attract a large number of people.

The great use of school education is not so much to teach you things _____ to teach you the art of learning.