Now the Great Wall is , so the Chinese authorities are working on a monitoring and warning system along the wall to preserve it in the future.
Much attention ____ pronunciation if you want to speak English well .
He must be in the park , ____ ?
— Shall I tell Tom about it ? — No , you ____ . I''ve told him already .
There used to be a church in the past , ____ ?
— There were already five people in the car but they managed to take me as well . — It ____ a comfortable journey .