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

The ability ________ an idea is as important as the idea itself.

The setting sun was reflected on the river, ________ everything along the banks ________ all the more beautiful.

No matter how frequently ________, the works of Beethoven still attract people all over the world.

_________ the stomachache, he couldn’t fall asleep.

Mrs Smith warned her daughter _________after drinking.

I’m going to do all I can ________the bad impression you have.

________ around the Taimountain Park, the tourists from Hong Kong were taken to visit the Mei Langang Memorial Museum. 

—Hi, Lydia. Are you going to the concert on Friday?—I’d like to. But there are so many problems_______.

Victor apologized for ________ to inform me of the change in the plan.

I feel like _________ a long walk. Would you like _______ with me?

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.

Generally speaking, prices of daily goods ______ through the Internet are lower than store prices．