Theory is ______ in that it can provide a direction for practice.
-What is the IOC?-It's ________the International Olympic Committee.
According to the timetable,the airplane will cover the ________from Beijing to Shanghai in an hour and a half.
Mr. Smith,__________today,will visit Japan for his new song next week.
—Do you mind ________alone at home?-No,but I want a good book________.
Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it's out of________.