There is _________"o" and _________ "1" in the word "bowl".
Hawaii is __________ beautiful beaches.
It’s ____ unusual chance for Mr White to get such ______ useful advice.
It’s a good habit of doing your homework _________ you come home from school.
Liu Xiang trained so hard ______ he hurt his foot.
– Will teachers _____ by computers in the future, Tony?–Maybe yes, maybe no. But I’m sure we’ll learn from both of them.