英语语法的问题I am afraid there (will be) a meeting this afternoon,

I am afraid there (will be) a meeting this afternoon, I can‘t join you.括号内的能用is going to be 吗?

There （will be ）two cinemas in that town next yeat,  括号内的能用are going to be 吗?

Yesterday was the first of June, it (was) children's day. all the students (were) very excited.为什么第2 和3空也是  过去时态呢?