U.S. President Barack Obama arrived in China’s economic center Shanghai on Sunday night, November 15th 2009, ______a state visit to China.
The river, _______the bank are covered with trees, is very long.
The editor’s job is to keep the newspaper_____and________to the readers.
It is thought that one billion people I the world,________is half the word’s workers, earn their living by farming.
I can’t find my watch. I must have ________it in the hotel.
Is Mr. Wang good at drawing his students into ________ discussion?