根据句意和汉语注释，写出单词的正确形式。

1.  Different people have different eating _____________ (习惯) around the world.

2.  “My little cat has died,” the boy said __________ (悲伤).

3.  Our teacher spent about half an hour ______________ (解释) the Maths problem to us.

4.  She had to make further ____________ (交流) with others before she made a decision.

5.  We all know that Zhao Wei is one of the best ____________ (演员) in China.