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—More than fifty students competed _______each other in the composition competition.
—But they could only compete _______three medals.

The company is famous ______ selling lots of cheap books over the web.

In my opinion, obviously, night-time is when children can begin to learn to feel confident ______, without being dependent on anyone else.

Japan is ____ the east of China, while India is ____ the west of China.

Five athletes competed_____ the gold medal _____ each other _____ the 100-meter dash.

He likes to sleep ______ all the windows _____.

The company building she usually worked ______every day has been pulled down for the City Center.

Don’t be too hard ________ David; he is only five years old.

Though _____ my opinion ,my mother didn’t say anything to show that she stood by me.

.Slang words (俚語) are made _____ special groups,such as workers and musicians.