下列词语中加线的字，每对读音都不相同的一项是(　　)

Have you heard of _______ death of Nelson Mandela —Yes. It is indeed _______ loss to the world.

y hand-held Reader, I’ve read more booksin the past six months than I ________ in the past six years.

With the gas _____, they had to quit the car and walked.

__________ of students are in the room and nine ________ of them are girls.