根据句意,写出括号内所给单词的适当形式。
The _________ (communicate) between people from two different countries becomes much easier with the help of the body language.
When you talk with English people, you’d better tell them your opinion _________ (direct).
Wuxi is in the _________ (south) part of Jiangsu Province.
With sales of 5.2 million _________ (copy), this comic book has become popular.