Ответ:

1)

 1. a

 2. b

 3. b

 4. a

 5. a

 6. a

2)

 1. had been swimming

 2. had not finished

 3. had climbed

 4. she had not expected

 5. had been working

 6. had you been looking for

3)

 1.  1a 2b

 2.  1b 2a

 3. 1a 2b

Объяснение: