Mr. Green’s tight _______ made him put off his trip to China.

Hardly a month goes by without ______ of another survey revealing new depths of scientific illiteracy among US citizens.

 The American girl has a good          of Chinese and can express herself freely in the language.

In the _____ of rain in the process of planting trees, you must stop.

It is said that dogs will keep you _________for as long as you want when you are feeling lonely．