Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,______two boys, aged 11 and 13, shot and killed a teacher and four girls.
With the final exam drawing near, everybody feels ____________ well prepared for it.
____________ all his hard work, he still failed to finish the task in time.
It is because he ___________ science that I __________ what he says.
Mr. Smith graduated from college at the age of 23, and ___________ he has been working as a teacher in a middle school.
While crossing the street, an old man was knocked down by a car and badly __________.