The environmental problem we are looking forward to _____ is __________ our attention.
In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
It’s easy to become ________to the children you work with.
During________ National Day holiday, I received________ endless messages from interested partners but none were suitable.
________anyone phone, tell them I’m in conference.
Well, since you ________ it like that, I can’t really refuse.