You can’t turn right when you see the sign _______.                    

—Do you know the meaning of the new word? It puzzles me a lot.—I’ve no idea. But I think you can look it up in          .

September 10th is __________ Day.

—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.

—Jim, which _________do you like best?—I like geography best.