4. The air is _________ polluted by exhaust fume from cars . ( serious)
5. Vietnamese women usually wear the aodai, ….…….on important occasion special
6. Hoa has just won the first prize in the English ________ contest. (speak)
7. He’s building a high fence around his garden so that the children can play in……….. (safe)
8. The use of light and dark __________ good and evil. ( symbol)