Ответ:

Задание 1

a) was

b) weren't

c) were

d) wasn't

Задание 2

Правильно: 1

Задание 3

1) was studying

2) were working

3) was doing homework

4) was surfing the net

5) were watching TV

6) was reading a book

Задание 4

1) was listening, arrived

2) rang, were talking

3) wasn't looking, asked

4) wasn't waiting, arrived

Объяснение: