grow的过去式和过去分词分别是什么

　　There is a growing need for qualified teachers of Business English.

　　对合格的商务英语教师的需求日益增长。

　　This work has grown in volume recently.

　　这项工作的量最近增加了。

　　My hair soon grew back to its natural colour.

　　我的头发很快又恢复了本色。