— What took you so long?— I got lost. I have no ________ of direction.

“ Laughing all the way” is from the song _________ ”  

---Are your grandparents in good _____?  ---Yes. Because they have quite _____ living habits.

—Will you fix up the machine according to the ______, David ? –No problem.

—You look so worried, what’s wrong?—More and more people like me become to worry about the __________ pollution  after the haze (雾霾) appeared in Beijing and some other cities in China.