(2014·福州市高中毕业班质量检查)Across all media，people are debating about________we need to keep track of every school bus on China’s road.

______ you talk or write a message to someone, you show your language skills to others.

I don’t know the reason        you were late for the meeting, but I’m sure someone will tell me        you don’t want to explain.

The little girl crossed a large area of grassland into the woods _________ she realized that she was lost.

That’s all for the introduction to your arrangements these days. So now ______ there are any questions, I’d like to go ahead and start the first video.