填空。 1. This is the professor _____ taught me chemistry in 1980. 2. The hospital ______ was built five years ago has been modemized. 3. This is the boy _____ father died three years ago. 4. The film_____ we saw the day before yesterday is very interesting. 5. Do you know the student ______was praised at the meeting? 6. 1949 is the year _____ the People's Republic of China was founded. 7. They work in a factory ______makes radio parts. 8. They work in a factory ______ radio parts are made. 9. This is the vision phone through ______  we can see and talk to our friends. 10. Here are players from Japan,some of ______ are our old friends.