Задание 1 :
1. was doing, came
2. was waiting
3. What were you doing when I rang you up?
4. was smoking, saw
задание 2 :
1. had left, got
2. hadn`t rung, finished
3. came, hadn`t gone
4. had eaten, went
задание 3 :
1. Anybody
2. anybody
3. Nothing
4. Nobody
задание 4 :
1. surprising
2. amusing
3. shocked
4. boring