Zhengnengliang, or positive energy, _______a term used in the book Positive Energy by Richard Wiseman, has developed into a popular phrase in Chinese society where people approach life with optimism and confidence.

These machines can help recycle the waste which would ______be thrown away.

Perhaps he is not quite fit for the job, but      , please let him have a try.

 With more and more farmers moving to cities, an inadequate labor force is    becoming a major factor affecting the country's grain output.

The earthquake in Yushu, Qinghai Province damaged many houses and business buildings； _______, it caused more than 1,000 deaths.