写出下列各句的同义句.（每空一词）
The Great Wall is a symbol of China.
The Great Wall ____ ____ China.
We take turns to help Tom learn English.
We help Tom learn English____ ____.
At the beginning,few people knew much about the Olympic Games.
____ ____,few people knew much about the Olympic Games.
Most of the boys hope to compete in the sports meet.
Most of the boys hope to ____ ____in the sports meet.
The Olympic Games is held by diffrent cities every four years.
Diffrent cities ____ the Olympic Games every four years.