I think is really difficult for me to memorize so many new words. A. it B. that C. This
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.
Have you finished the work _________?