Whatever he does，once he sets up a goal，he will start pursuing it without ________.

________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.

(2013·新课标全国卷Ⅰ)The door ________ open, no matter how hard she pushed.

It is a spectacular __________ as the fireworks are set off and light up the sky during the Spring Festival.

Tom didn’t break the glass by accident．It was _________．