Listen to the dialouge between Lan and Mark. Pay attention to the underlined parts ( Nghe đoạn hội thoại giữa Lan và Mark. Chú ý đến phần gạch chân) Lan: What did you do to help your community last summer Mark? Mark: We planted some trees in the schoolyard and picked up a lot of rubbish along the nearby roads. Lan: Sounds like great work! We collected books and warm clothes for our friends in the mountainous areas. Mark: Wonderful.