Oxford Discover 3 - Unit 10: Where does energy come from? - Lesson 4
<p><strong>1. Ôn tập từ vựng: </strong></p><p>Subway, fire engine, carpool, ambulance, escalator, train, taxi, elevator, helicopter, trafic jam</p><p> </p><p><strong>2. Ngữ pháp:</strong></p><p>“Indefinite and Definite Articles”</p><p>Use the Indefinite Articles “a” and “an” when you write about something for the first time.