Ответ:

Задание 1

1. recycling

2. rainforest

3. volunteers

4. nesting

5. acid rain

Задание 2

1. has been playing

2. she has been writing

3. haven't been sleeping

4. Have you been working

5. have been painting

Задание 3

1. is he

2. doesn't she

3. won't you

4. has she

5. did he

Задание 4

1. a

2.b

3.b

4.c