Mrs Brown always takes things _________ too seriously, which makes the people around her uneasy.

It’s reported that global warming is heating the planet twice as quickly as _____ feared.

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

 Our bodies are strengthened by taking exercise.  ________，our minds are developed by learning. 

As is often pointed out, knowledge is a two-edged weapon which can be used ________ for good or evil．