Shanghai is the city ______ the 2010 world Expo is held. –So it is a city____ most of us want to vist this summer.

How does Meimei go to school?—She ________ a bus, but now she walks to school. [ ]

Is your pen pal Australia or Canada?

Tell the kid to ________ the fireworks(烟花、爆竹)，please.——Yes, you are right.

Mind your steps, guy! Don’t you see the words “_______ the grass”?—I’m sorry.