用方框中短语的正确形式填空. be based on,    dress up,    be good at,    have difficulty in,    belong to,    play a role of,    die from 1. In big cities during cold winter months, many old people _____ the polluted air. 2. We are supposed to _____ as movie characters for theparty. What a nice idea! 3. As we all know, Taiwan _____ China. 4. I used to _____ playing table tennis, but now I'm out of practice. 5. Most students _____ sleeping well because of their too much schoolwork. 6. The play _____ a real story that happened in the1940s in the countryside. 7. Jackie _____ a policeman in his last movie.