1.   He thought that he should concentrate in the laboratory sciences but he failed chemistry.

2.   Marquee players at the school have excused themselves from these so-called optional workouts before, which might explain why recent USC teams have failed chemistry.

3.   The Lakers may have failed chemistry.

4.   The three principal characters have an engaging affability that is missing from most freshman comedies, which tend to fail chemistry.

5.   When I was failing chemistry, Mr. Gilmore, a former teacher and then school administrator, offered me tutoring.