The lady in the sitting room be over sixty. She looks so young.
—_______have you visited Nanjing? —Three times.
He ________be at home because the light in his room is on.
We ________ our hands while they were singing on the stage.
—Have you ever ________ to the Great Wall? —Yes, I _______ there last autumn.
The words _________ by Miss Li are marked ________ red.