________ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured.
Health problems are closely connected with bad eating habits and a ____ of exercise.
It is reported that two schools, _____ are being built in my hometown, will open next year.
By serving others, a person focuses on someone other than himself or herself, ______ can be very eye-opening and rewarding.
The book is of great value. _____ can be enjoyed unless you digest it.
–I’d like some more cheese. –Sorry, there’s ______ left.