— Where are Maria and Kangkang?—They _____ England.A. have been toB. have been inC. have gone to
If you sit in a chair _____a long time, your back may begin to hurt.
Photography can be ______excellent hobby for kids.
Tell Sally to call _____, please.
—Merry Christmas! —_______.
The policeman caught the thief ______ has stolen Mr. Li’s computer.