There are 30 __________ in the hospital.

—What         are you in?—I’m in __________ 8, Grade 7.

In public places; could you please payto your behavior?

—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.

Li Ling wants to be a singer, she thinks it’s an interesting __________.