Children are____to meet with setbacks (挫折) as they grow up,so their parents don’t have to worry about it.
Who is it up ____ decide whether to go or not?
Wang Mei is one of many Chinese teenagers _____ “on the go”
The two boys fought and fought until one ______.
He will _____ our class to sing at the school singing contest.
----Where is Mary? ----At ____.