e Great Wall is , so the Chinese authorities are working on a monitoring and warning system along the wall to preserve it in the future.

Do you know the man Li An— Yes. He is regarded as one of the directors in our country.

I slept three hours yesterday.一That’s terrible. Enough sleep is for health.

Ladies and gentlemen, please fasten your seat belts. The plane ______..

Mr.Green can’t go to the meeting he has a bad cold.