I/

1. They were very sorry to stay at home

2. We were disappointed that you couldn't attend the meeting

3. He was disappointed that she failed her exam

4. I was worried that you wouldn't come back

5. They are lucky to pass all the exams

6. We were sorry to hear about your father's illness

7. I was worried that they wouldn't come back

8. I am sure that he will win the game

9. I'm afraid that she can't come

10. I am ashamed that nothing better to offer you

II/

1. presentation                                    2. natural

3. dangerous                                       4. fertilizer

5. recycling                                          6. used

7. wooden                                           8. protector

III/

1. is made                                            2. are caused

3. are employed                                  4. are showed

5. are covered                                     6. is surrounded

7. are usually held                               8. is ... pronounced

9. are made                                         10. am taken