2014年4月24日,现年70岁的北京人高瑜因涉嫌泄露国家机密被刑拘。对此,关于严守国家机密,下列说法不正确的是( )
_____ he was tired , ____ he didn’t stop working .
Please _______the light when you leave the classroom.
—Can you answer this question? -- Sorry, I can _________ understand its meaning.
---Hurry up, _______ you will miss the exciting part of the film.
This book _______ be Li Lei’s. Look! Her name is on the cover.