During the Spring Festival, the police are ______ the public safety.
--- Oh, dear. I forgot the air tickets. --- You ______ something.
—Many of my classmates have a bad opinion of Li Xiaojun.—____.
It was playing computer games that cost the boy plenty of time he ____ doing his lessons.
Maybe you have been to many interesting places, but nowhere else in China ____ such a beautiful place.
While in London, we paid a visit to the hospital founded____ Florence Nightingale.