Я бы так выполнила.
1. I think you should get a professional opinion.
2. My music teacher expects nothing less than excellence.(или excellent)
3. James knew he wanted to become a sailor the first time he stepped on a yacht.
4. I`m taking pills to inactivate my high blood pressure.
5. How many employees do you have working for you?
6. She had a look of confusion on her face.
7. The sauce was rich and creamed.
8. We need to finalize the date of our wedding soon.
9. She asked the dressmaker to lengthen her trousers.
10. He went to a prison for the criminal sanity.
11. This is a no smoking area. You aren't allowed to smoke in here.
12. The inhabitants of this city left long ago.
13. George pointed out the distinction between science fiction and fantasy.
14. She is extremely childish. She should grow up.
15. My parents give me a small allowance each week.
2) would have given
3) were
4) phoned
5) hadn't invented
6) could
7) wouldn't have dried out
8) had followed