notonlyauniversalentertainmentmodeinmoderntimes,but also an important ________ for cultural communication

Here____! Where is Xiao Liu　 —- There____.

I think the older people must be _______ politely. —Yes. You are so kind.

While we are developing agriculture and industry, we must prevent the earth ______.

It ____ that all the students were having lessons in the teaching buildings when the earthquake occurred.