Ответ:
1. a
2. a
3. b
4. b
5. a
6. b
7. b
1. My wife has been drawing for 5 years, but she has sold no pictures.
2. I'm glad that we've finished this work.
3. My hands are dirty. I've been working in the garden.
4. Nick has eaten all sweets.
5. Have you ever played chess?