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Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．

The first textbooks ______ for teaching English as a foreign language came out in the 16th             century.

Rose found her toy bear _______ under the chair.

—How about your travel?
—You can hardly imagine what difficulty we have had ______ the vast desert.

______ with people in the West, people in the East pay more attention to their family.

Unfortunately，the band ______ of a singer, two guitarists and a drummer broke up soon.

She pretended ______ to the manager，but actually she was thinking about something else.

Passengers are permitted    only one piece of hand luggage onto the plane.

The country has already sent up three unmanned spacecraft , the most recent    at the end of last March.

The traffic rule says young children under the age of four and        less than 40 pounds must be in a child safety seat.