We believe that sports can_______ mind and body.
Between the two generations, it is often their different views of life and value _______ cause family conflicts.
_________ a certain doubt among the people as to the practical value of the project.
The hours ________ the children spend in their one way relationship with television people undoubtedly affect their relationships with real-life people.
Low-carbon lifestyle is of great benefit to improve the world environment, but the problem is difficult to _________.
After ten years abroad, he still recognized his old colleagues ________ he set foot in China.