The rising house price and the high income tax rate have become the biggest ______ of the ordinary people in China today．

While traveling, whether on business or for _____ , you often need to stay in a hotel.

 We have to keep       with the changing times.

I’m afraid none of us can __________ the machine that has been imported from abroad.Which of the following is wrong?

Hundreds of people gave their lives in _____ of freedom.