This book gives a brief _____ of the history of the castle and details of the art collection in the main hall.
The boss made him work 14 hours a day. That means, he _______ work 14 hours a day.
When I got to his home, he ________ for an hour.
The visitors are very ______ to see so many changes _______ in Shenzhen since 1979.
–Have you ever traveled abroad? --Sure. I ____ the language of English in the USA two years after I graduated from the university.
–Hi, Kate! --Hi, Mary. I ______ you are here. A. don’t know B. don’t think C, think D. didn’t know