Her dress was spotlessly clean and well made,but it was______kind of ______dress which the daughter of a poor man might have worn.

Even though you fail         first time, you can still try         second time.

The radiation of uranium was then regarded as_____secret of_____nature.

The climate change conference has come to __________ end, but the developing countries are dissatisfied with __________ small step that the developed countries have taken to reduce the emission(排放) of water gases.

With ________ look of disappointment, he left the Student Union office. Without ________ knowledge of photographing, he missed the chance to be an editor of Babel.