There is _______milk in the bottle, let’s go to the supermarket to buy some.
Try to buy one before all the tickets ________.
—_______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.