Workers can’t be made ________ for twelve hours a day.
—Have you ever heard of Langlang?—Sure. He is one of ______ pianists ______ I have even seen.
—Have you heard of the Big Ben? —Of course. It a symbol of UK.
—Please say something about Zheng He.—Oh! He is the Ming dynasty explorer of ______ all the Chinese are proud.
—Where is North Korea?—It lies ______ the northeast of China.
—Are the beaches in Dalian beautiful?—Sure. They___________ lots of tourists from home and abroad every year.