用适当的连词完成下列状语从句：

________ they arrived at the cinema, the film had already begun.

用适当的连词完成下列状语从句：

I don't like summer here ________ it is very hot.

用适当的连词完成下列状语从句：

It was ________ good news ________ we were all very happy to hear it.

用适当的连词完成下列状语从句：

They went on working ________ it was very cold.

用适当的连词完成下列状语从句：

________ I had done my homework, I went home.