一、答案
| 1 | 2 | 3 | 4 | 5 |
| C | B | C | D | A |
二、答案
1. was; making/on; to
2. realized; was
3. at the time of
4. happening to
5. saw; lying
三、答案
1. was watching
2. What was; doing
3. while
4. Did; get
四、答案
(1) happened
(2) forgot
(3) stopped
(4) Unluckily/Unfortunately
(5) needn't
(6) was