I. Choose the best answer.

1. The ao dai is usually made of a light   .................

    A. cotton

    B. design

    C. symbol

    D. material

2. They................. in Hue................. a long time.

    A. were living/ for

    B. were living/ since

    C. have lived/ for

    D. have lived/ since

3. These plants .................................. for animals' food.

    A. can grow

    B. can be grown

    C. have grown

    D. grow