Four teams of three people would compete ______ the game andthe winners would receive a free vacation.

ailed to seek a job for his poor education,though he was ____to get one to support his family.

It is ________ the customers’ needs that has made chain stores so popular in big cities in China

Mr. Black talked about his son with the teacher ________ the phone.

I ______ peaceful countryside ______ noisycities while my sister prefers _____ in the modern cities.