Ex3.
1. While he was walking his dog, he met his old friend.
2. Yesterday I got up . . .
3. were watching / knocked
4. were reading / came
5. was writing
ex5.
1. shy
2. shrugged
3. reliable
4. patient
5. clenched
6. stubborn
7. sociable
8. selfish
9. insincere
10. pessimistic