English-Listening app for iPhone and iPad

The app is designed to focus on listening skill of listener. There are one transcript and exercise in each lesson, listener may do exercise after listening conversation or immediately while listening. Listener can switch between exercise and transcript.
Feature
There are 3 levels for listener. There are 34 lessons in each level. Basing on capability, listener should choose corresponding level.
Display transcript and exercise while opening audio.
The app can run on two modes: online and offline.
Support downloading audio and listen at offline mode.
The app has irregular verb table. It will support listener while doing exercise or simply check irregular verb.