52.2.
2. It's (very) expensive, isn't it?
3. The course was great, wasn't it?
4. You've had your hair cut, haven't you or You had your hair cut, didn't you?
5. She has a good voice, doesn't she? or She has got a good voice, hasn't she?
6. It doesn't look right, does it?
7. This bridge isn't very safe, is it? or This bridge doesn't look very safe, does it?