Please study English words with Center Test English Vocabulary. There is an issue where English voices do not sound correctly on some Android devices. If you cannot hear the correct audio, please download Speech Recognition & Synthesis and English audio data. 1. Download Speech Recognition & Synthesis from Play store 2. Device settings > Language and input > Text-to-speech output > Preferred engine > Select Google text-to-speech 3. Press the settings button next to Google Text-to-speech > Setti