I'm looking for some new (a)   (apply) to put on my smartphone to improve my English pronunciation.

Our students are very excited when they have opportunities to do (a)   (physics) exercise.

Writing word in English: nhận dạng giọng nói

(a)  

My son, who is a (a)   (promise) pianist, is now interested in composing electronic music.

The Internet will motivate students to study more (a)   (effect).