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The number of Chinese speakers in the world ________with the development of China is much larger than ever before..

________ the mountains was hard work for them but as they looked around, they could not help screaming.

It was so bright outdoors that we could see clearly what was happening through the curtains ________ before the window.

A driver should ________ the road when _________.

The waters off the Diaoyu islands, first _____ in Ming Dynasty, are our traditional fishing area.

In order to prevent the disease ___________ to other districts, the authorized organization killed thousands and thousands of cows.

My father _______ for London tomorrow， for there is______ an  important meeting there.

________ himself in the newspaper, he didn’t notice what was happening．

Henry escaped ________ by admitting his mistake as soon as he saw the headmaster．

_____many times, they succeeded _________ the experiment.